CVE-2026-20004 (GCVE-0-2026-20004)
Vulnerability from cvelistv5
Published
2026-03-25 16:04
Modified
2026-03-26 17:38
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-771 - Missing Reference to Active Allocated Resource
Summary
A vulnerability in the TLS library of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust the available memory of an affected device.
This vulnerability is due to improper management of memory resources during TLS connection setup. An attacker could exploit this vulnerability by repeatedly triggering the conditions that cause the memory increase. This could be done in a variety of ways, such as by repeatedly attempting Extensible Authentication Protocol (EAP) authentication when local EAP is enabled on an affected device or by using a machine-in-the-middle attack and resetting TLS connections between the affected device and other devices. A successful exploit could allow the attacker to exhaust the available memory on an affected device, resulting in an unexpected reload and a denial of service (DoS) condition.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Cisco | Cisco IOS XE Software |
Version: 16.9.1 Version: 16.9.2 Version: 16.9.1a Version: 16.9.1b Version: 16.9.1s Version: 16.9.3 Version: 16.9.4 Version: 16.9.3a Version: 16.9.5 Version: 16.9.5f Version: 16.9.6 Version: 16.9.7 Version: 16.9.8 Version: 16.10.1 Version: 16.10.1a Version: 16.10.1b Version: 16.10.1s Version: 16.10.1c Version: 16.10.1e Version: 16.10.1d Version: 16.10.2 Version: 16.10.1f Version: 16.10.1g Version: 16.10.3 Version: 16.11.1 Version: 16.11.1a Version: 16.11.1b Version: 16.11.2 Version: 16.11.1s Version: 16.12.1 Version: 16.12.1s Version: 16.12.1a Version: 16.12.1c Version: 16.12.1w Version: 16.12.2 Version: 16.12.1y Version: 16.12.2a Version: 16.12.3 Version: 16.12.8 Version: 16.12.2s Version: 16.12.1x Version: 16.12.1t Version: 16.12.4 Version: 16.12.3s Version: 16.12.3a Version: 16.12.4a Version: 16.12.5 Version: 16.12.6 Version: 16.12.1z1 Version: 16.12.5a Version: 16.12.5b Version: 16.12.1z2 Version: 16.12.6a Version: 16.12.7 Version: 16.12.9 Version: 16.12.10 Version: 16.12.10a Version: 16.12.11 Version: 16.12.12 Version: 16.12.13 Version: 16.12.14 Version: 16.12.15 Version: 17.1.1 Version: 17.1.1a Version: 17.1.1s Version: 17.1.1t Version: 17.1.3 Version: 17.2.1 Version: 17.2.1r Version: 17.2.1a Version: 17.2.1v Version: 17.2.2 Version: 17.2.3 Version: 17.3.1 Version: 17.3.2 Version: 17.3.3 Version: 17.3.1a Version: 17.3.1w Version: 17.3.2a Version: 17.3.1x Version: 17.3.1z Version: 17.3.4 Version: 17.3.5 Version: 17.3.4a Version: 17.3.6 Version: 17.3.4b Version: 17.3.4c Version: 17.3.5a Version: 17.3.5b Version: 17.3.7 Version: 17.3.8 Version: 17.3.8a Version: 17.4.1 Version: 17.4.2 Version: 17.4.1a Version: 17.4.1b Version: 17.4.2a Version: 17.5.1 Version: 17.5.1a Version: 17.6.1 Version: 17.6.2 Version: 17.6.1w Version: 17.6.1a Version: 17.6.1x Version: 17.6.3 Version: 17.6.1y Version: 17.6.1z Version: 17.6.3a Version: 17.6.4 Version: 17.6.1z1 Version: 17.6.5 Version: 17.6.6 Version: 17.6.6a Version: 17.6.5a Version: 17.6.7 Version: 17.6.8 Version: 17.6.8a Version: 17.7.1 Version: 17.7.1a Version: 17.7.1b Version: 17.7.2 Version: 17.10.1 Version: 17.10.1a Version: 17.10.1b Version: 17.8.1 Version: 17.8.1a Version: 17.9.1 Version: 17.9.1w Version: 17.9.2 Version: 17.9.1a Version: 17.9.1x Version: 17.9.1y Version: 17.9.3 Version: 17.9.2a Version: 17.9.1x1 Version: 17.9.3a Version: 17.9.4 Version: 17.9.1y1 Version: 17.9.5 Version: 17.9.4a Version: 17.9.5a Version: 17.9.5b Version: 17.9.6 Version: 17.9.6a Version: 17.9.5e Version: 17.9.5f Version: 17.11.1 Version: 17.11.1a Version: 17.12.1 Version: 17.12.1w Version: 17.12.1a Version: 17.12.1x Version: 17.12.2 Version: 17.12.3 Version: 17.12.2a Version: 17.12.1y Version: 17.12.1z Version: 17.12.4 Version: 17.12.3a Version: 17.12.1z1 Version: 17.12.1z2 Version: 17.12.4a Version: 17.12.4b Version: 17.12.1z3 Version: 17.12.1z4 Version: 17.12.1z5 Version: 17.12.1z6 Version: 17.13.1 Version: 17.13.1a Version: 17.14.1 Version: 17.14.1a Version: 17.15.1 Version: 17.15.1w Version: 17.15.1a Version: 17.15.1b Version: 17.15.1x Version: 17.15.1z Version: 17.15.1y Version: 17.16.1 Version: 17.16.1a |
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"value": "A vulnerability in the TLS library of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust the available memory of an affected device.\r\n\r This vulnerability is due to improper management of memory resources during TLS connection setup. An attacker could exploit this vulnerability by repeatedly triggering the conditions that cause the memory increase. This could be done in a variety of ways, such as by repeatedly attempting Extensible Authentication Protocol (EAP) authentication when local EAP is enabled on an affected device or by using a machine-in-the-middle attack and resetting TLS connections between the affected device and other devices. A successful exploit could allow the attacker to exhaust the available memory on an affected device, resulting in an unexpected reload and a denial of service (DoS) condition."
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"value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
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"vulnerability-lookup:meta": {
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"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20004\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-26T17:38:35.255782Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-26T17:38:39.794Z\"}}], \"cna\": {\"source\": {\"defects\": [\"CSCwm80596\", \"CSCwk59707\"], \"advisory\": \"cisco-sa-iosxe-tls-dos-TVgLDEZL\", \"discovery\": \"EXTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 7.4, \"attackVector\": \"ADJACENT_NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco IOS XE Software\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.9.1\"}, {\"status\": \"affected\", \"version\": \"16.9.2\"}, {\"status\": \"affected\", \"version\": \"16.9.1a\"}, {\"status\": \"affected\", \"version\": \"16.9.1b\"}, {\"status\": \"affected\", \"version\": \"16.9.1s\"}, {\"status\": \"affected\", \"version\": \"16.9.3\"}, {\"status\": \"affected\", \"version\": \"16.9.4\"}, {\"status\": \"affected\", \"version\": \"16.9.3a\"}, {\"status\": \"affected\", \"version\": \"16.9.5\"}, {\"status\": \"affected\", \"version\": \"16.9.5f\"}, {\"status\": \"affected\", \"version\": \"16.9.6\"}, {\"status\": \"affected\", \"version\": \"16.9.7\"}, {\"status\": \"affected\", \"version\": \"16.9.8\"}, {\"status\": \"affected\", \"version\": \"16.10.1\"}, {\"status\": \"affected\", \"version\": \"16.10.1a\"}, {\"status\": \"affected\", \"version\": \"16.10.1b\"}, {\"status\": \"affected\", \"version\": \"16.10.1s\"}, {\"status\": \"affected\", \"version\": \"16.10.1c\"}, {\"status\": \"affected\", \"version\": \"16.10.1e\"}, {\"status\": \"affected\", \"version\": \"16.10.1d\"}, {\"status\": \"affected\", \"version\": \"16.10.2\"}, {\"status\": \"affected\", \"version\": \"16.10.1f\"}, {\"status\": \"affected\", \"version\": \"16.10.1g\"}, {\"status\": \"affected\", \"version\": \"16.10.3\"}, {\"status\": \"affected\", \"version\": \"16.11.1\"}, {\"status\": \"affected\", \"version\": \"16.11.1a\"}, {\"status\": \"affected\", \"version\": \"16.11.1b\"}, {\"status\": \"affected\", \"version\": \"16.11.2\"}, {\"status\": \"affected\", \"version\": \"16.11.1s\"}, {\"status\": \"affected\", \"version\": \"16.12.1\"}, {\"status\": \"affected\", \"version\": \"16.12.1s\"}, {\"status\": \"affected\", \"version\": \"16.12.1a\"}, {\"status\": \"affected\", \"version\": \"16.12.1c\"}, {\"status\": \"affected\", \"version\": \"16.12.1w\"}, {\"status\": \"affected\", \"version\": \"16.12.2\"}, {\"status\": \"affected\", \"version\": \"16.12.1y\"}, {\"status\": \"affected\", \"version\": \"16.12.2a\"}, {\"status\": \"affected\", \"version\": \"16.12.3\"}, {\"status\": \"affected\", \"version\": \"16.12.8\"}, {\"status\": \"affected\", \"version\": \"16.12.2s\"}, {\"status\": \"affected\", \"version\": \"16.12.1x\"}, {\"status\": \"affected\", \"version\": \"16.12.1t\"}, {\"status\": \"affected\", \"version\": \"16.12.4\"}, {\"status\": \"affected\", \"version\": \"16.12.3s\"}, {\"status\": \"affected\", \"version\": \"16.12.3a\"}, {\"status\": \"affected\", \"version\": \"16.12.4a\"}, {\"status\": \"affected\", \"version\": \"16.12.5\"}, {\"status\": \"affected\", \"version\": \"16.12.6\"}, {\"status\": \"affected\", \"version\": \"16.12.1z1\"}, {\"status\": \"affected\", \"version\": \"16.12.5a\"}, {\"status\": \"affected\", \"version\": \"16.12.5b\"}, {\"status\": \"affected\", \"version\": \"16.12.1z2\"}, {\"status\": \"affected\", \"version\": \"16.12.6a\"}, {\"status\": \"affected\", \"version\": \"16.12.7\"}, {\"status\": \"affected\", \"version\": \"16.12.9\"}, {\"status\": \"affected\", \"version\": \"16.12.10\"}, {\"status\": \"affected\", \"version\": \"16.12.10a\"}, {\"status\": \"affected\", \"version\": \"16.12.11\"}, {\"status\": \"affected\", \"version\": \"16.12.12\"}, {\"status\": \"affected\", \"version\": \"16.12.13\"}, {\"status\": \"affected\", \"version\": \"16.12.14\"}, {\"status\": \"affected\", \"version\": \"16.12.15\"}, {\"status\": \"affected\", \"version\": \"17.1.1\"}, {\"status\": \"affected\", \"version\": \"17.1.1a\"}, {\"status\": \"affected\", \"version\": \"17.1.1s\"}, {\"status\": \"affected\", \"version\": \"17.1.1t\"}, {\"status\": \"affected\", \"version\": \"17.1.3\"}, {\"status\": \"affected\", \"version\": \"17.2.1\"}, {\"status\": \"affected\", \"version\": \"17.2.1r\"}, {\"status\": \"affected\", \"version\": \"17.2.1a\"}, {\"status\": \"affected\", \"version\": \"17.2.1v\"}, {\"status\": \"affected\", \"version\": \"17.2.2\"}, {\"status\": \"affected\", \"version\": \"17.2.3\"}, {\"status\": \"affected\", \"version\": \"17.3.1\"}, {\"status\": \"affected\", \"version\": \"17.3.2\"}, {\"status\": \"affected\", \"version\": \"17.3.3\"}, {\"status\": \"affected\", \"version\": \"17.3.1a\"}, {\"status\": \"affected\", \"version\": \"17.3.1w\"}, {\"status\": \"affected\", \"version\": \"17.3.2a\"}, {\"status\": \"affected\", \"version\": \"17.3.1x\"}, {\"status\": \"affected\", \"version\": \"17.3.1z\"}, {\"status\": \"affected\", \"version\": \"17.3.4\"}, {\"status\": \"affected\", \"version\": \"17.3.5\"}, {\"status\": \"affected\", \"version\": \"17.3.4a\"}, {\"status\": \"affected\", \"version\": \"17.3.6\"}, {\"status\": \"affected\", \"version\": \"17.3.4b\"}, {\"status\": \"affected\", \"version\": \"17.3.4c\"}, {\"status\": \"affected\", \"version\": \"17.3.5a\"}, {\"status\": \"affected\", \"version\": \"17.3.5b\"}, {\"status\": \"affected\", \"version\": \"17.3.7\"}, {\"status\": \"affected\", \"version\": \"17.3.8\"}, {\"status\": \"affected\", \"version\": \"17.3.8a\"}, {\"status\": \"affected\", \"version\": \"17.4.1\"}, {\"status\": \"affected\", \"version\": \"17.4.2\"}, {\"status\": \"affected\", \"version\": \"17.4.1a\"}, {\"status\": \"affected\", \"version\": \"17.4.1b\"}, {\"status\": \"affected\", \"version\": \"17.4.2a\"}, {\"status\": \"affected\", \"version\": \"17.5.1\"}, {\"status\": \"affected\", \"version\": \"17.5.1a\"}, {\"status\": \"affected\", \"version\": \"17.6.1\"}, {\"status\": \"affected\", \"version\": \"17.6.2\"}, {\"status\": \"affected\", \"version\": \"17.6.1w\"}, {\"status\": \"affected\", \"version\": \"17.6.1a\"}, {\"status\": \"affected\", \"version\": \"17.6.1x\"}, {\"status\": \"affected\", \"version\": \"17.6.3\"}, {\"status\": \"affected\", \"version\": \"17.6.1y\"}, {\"status\": \"affected\", \"version\": \"17.6.1z\"}, {\"status\": \"affected\", \"version\": \"17.6.3a\"}, {\"status\": \"affected\", \"version\": \"17.6.4\"}, {\"status\": \"affected\", \"version\": \"17.6.1z1\"}, {\"status\": \"affected\", \"version\": \"17.6.5\"}, {\"status\": \"affected\", \"version\": \"17.6.6\"}, {\"status\": \"affected\", \"version\": \"17.6.6a\"}, {\"status\": \"affected\", \"version\": \"17.6.5a\"}, {\"status\": \"affected\", \"version\": \"17.6.7\"}, {\"status\": \"affected\", \"version\": \"17.6.8\"}, {\"status\": \"affected\", \"version\": \"17.6.8a\"}, {\"status\": \"affected\", \"version\": \"17.7.1\"}, {\"status\": \"affected\", \"version\": \"17.7.1a\"}, {\"status\": \"affected\", \"version\": \"17.7.1b\"}, {\"status\": \"affected\", \"version\": \"17.7.2\"}, {\"status\": \"affected\", \"version\": \"17.10.1\"}, {\"status\": \"affected\", \"version\": \"17.10.1a\"}, {\"status\": \"affected\", \"version\": \"17.10.1b\"}, {\"status\": \"affected\", 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{\"status\": \"affected\", \"version\": \"17.9.6a\"}, {\"status\": \"affected\", \"version\": \"17.9.5e\"}, {\"status\": \"affected\", \"version\": \"17.9.5f\"}, {\"status\": \"affected\", \"version\": \"17.11.1\"}, {\"status\": \"affected\", \"version\": \"17.11.1a\"}, {\"status\": \"affected\", \"version\": \"17.12.1\"}, {\"status\": \"affected\", \"version\": \"17.12.1w\"}, {\"status\": \"affected\", \"version\": \"17.12.1a\"}, {\"status\": \"affected\", \"version\": \"17.12.1x\"}, {\"status\": \"affected\", \"version\": \"17.12.2\"}, {\"status\": \"affected\", \"version\": \"17.12.3\"}, {\"status\": \"affected\", \"version\": \"17.12.2a\"}, {\"status\": \"affected\", \"version\": \"17.12.1y\"}, {\"status\": \"affected\", \"version\": \"17.12.1z\"}, {\"status\": \"affected\", \"version\": \"17.12.4\"}, {\"status\": \"affected\", \"version\": \"17.12.3a\"}, {\"status\": \"affected\", \"version\": \"17.12.1z1\"}, {\"status\": \"affected\", \"version\": \"17.12.1z2\"}, {\"status\": \"affected\", \"version\": \"17.12.4a\"}, {\"status\": \"affected\", \"version\": \"17.12.4b\"}, {\"status\": \"affected\", \"version\": \"17.12.1z3\"}, {\"status\": \"affected\", \"version\": \"17.12.1z4\"}, {\"status\": \"affected\", \"version\": \"17.12.1z5\"}, {\"status\": \"affected\", \"version\": \"17.12.1z6\"}, {\"status\": \"affected\", \"version\": \"17.13.1\"}, {\"status\": \"affected\", \"version\": \"17.13.1a\"}, {\"status\": \"affected\", \"version\": \"17.14.1\"}, {\"status\": \"affected\", \"version\": \"17.14.1a\"}, {\"status\": \"affected\", \"version\": \"17.15.1\"}, {\"status\": \"affected\", \"version\": \"17.15.1w\"}, {\"status\": \"affected\", \"version\": \"17.15.1a\"}, {\"status\": \"affected\", \"version\": \"17.15.1b\"}, {\"status\": \"affected\", \"version\": \"17.15.1x\"}, {\"status\": \"affected\", \"version\": \"17.15.1z\"}, {\"status\": \"affected\", \"version\": \"17.15.1y\"}, {\"status\": \"affected\", \"version\": \"17.16.1\"}, {\"status\": \"affected\", \"version\": \"17.16.1a\"}]}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-tls-dos-TVgLDEZL\", \"name\": \"cisco-sa-iosxe-tls-dos-TVgLDEZL\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the TLS library of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust the available memory of an affected device.\\r\\n\\r This vulnerability is due to improper management of memory resources during TLS connection setup. An attacker could exploit this vulnerability by repeatedly triggering the conditions that cause the memory increase. This could be done in a variety of ways, such as by repeatedly attempting Extensible Authentication Protocol (EAP) authentication when local EAP is enabled on an affected device or by using a machine-in-the-middle attack and resetting TLS connections between the affected device and other devices. A successful exploit could allow the attacker to exhaust the available memory on an affected device, resulting in an unexpected reload and a denial of service (DoS) condition.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-771\", \"description\": \"Missing Reference to Active Allocated Resource\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-03-25T16:04:48.379Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20004\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-26T17:38:43.815Z\", \"dateReserved\": \"2025-10-08T11:59:15.349Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-03-25T16:04:48.379Z\", \"assignerShortName\": \"cisco\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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