CVE-2026-20311 (GCVE-0-2026-20311)
Vulnerability from cvelistv5
Published
2026-08-05 16:32
Modified
2026-08-05 17:45
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-126 - Buffer Over-read
Summary
A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to insufficient error handling in the web-based management interface. An attacker could exploit this vulnerability by authenticating with a malformed certificate. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Cisco | Cisco IOS XE Software |
Version: 17.3.1 Version: 17.3.1a Version: 17.3.2a Version: 17.3.1w Version: 17.3.2 Version: 17.4.1 Version: 17.4.1a Version: 17.3.1x Version: 17.3.3 Version: 17.5.1 Version: 17.4.1b Version: 17.3.1z Version: 17.4.2 Version: 17.3.3a Version: 17.3.5 Version: 17.3.4 Version: 17.5.1a Version: 17.6.1 Version: 17.3.4a Version: 17.6.1a Version: 17.7.1 Version: 17.6.1x Version: 17.6.2 Version: 17.3.4c Version: 17.4.2a Version: 17.3.4b Version: 17.7.1a Version: 17.8.1a Version: 17.6.3a Version: 17.6.3 Version: 17.7.2 Version: 17.7.1b Version: 17.9.1w Version: 17.3.5a Version: 17.6.1z Version: 17.8.1 Version: 17.9.1 Version: 17.6.4 Version: 17.3.5b Version: 17.9.1a Version: 17.3.6 Version: 17.10.1 Version: 17.6.1z1 Version: 17.10.1a Version: 17.9.2 Version: 17.6.5 Version: 17.9.1x Version: 17.9.1y Version: 17.3.7 Version: 17.9.2a Version: 17.9.3 Version: 17.11.1 Version: 17.10.1b Version: 17.6.6 Version: 17.9.1x1 Version: 17.11.1a Version: 17.9.3a Version: 17.12.1 Version: 17.3.8 Version: 17.9.4 Version: 17.12.1w Version: 17.9.1y1 Version: 17.12.1a Version: 17.9.5 Version: 17.13.1 Version: 17.12.1x Version: 17.12.2 Version: 17.14.1 Version: 17.9.4a Version: 17.3.8a Version: 17.6.6a Version: 17.6.5a Version: 17.6.7 Version: 17.15.1 Version: 17.13.1a Version: 17.12.2a Version: 17.12.3 Version: 17.12.1y Version: 17.12.1z Version: 17.9.5a Version: 17.14.1a Version: 17.9.5b Version: 17.6.8 Version: 17.12.4 Version: 17.9.6 Version: 17.17.1 Version: 17.16.1 Version: 17.15.1w Version: 17.12.3a Version: 17.9.5c Version: 17.15.1a Version: 17.12.1z1 Version: 17.15.2 Version: 17.15.1b Version: 17.9.5d Version: 17.15.1x Version: 17.9.6a Version: 17.12.1z2 Version: 17.6.8a Version: 17.16.1a Version: 17.15.3 Version: 17.9.7 Version: 17.12.5 Version: 17.15.1y Version: 17.9.5e Version: 17.12.4a Version: 17.15.2a Version: 17.15.2c Version: 17.15.2b Version: 17.12.1z3 Version: 17.9.5f Version: 17.12.4b Version: 17.12.5a Version: 17.18.1 Version: 17.12.6 Version: 17.12.1z4 Version: 17.9.8 Version: 17.9.7a Version: 17.15.3a Version: 17.15.4 Version: 17.12.5b Version: 17.15.3b Version: 17.18.1z Version: 17.9.7b Version: 17.12.5c Version: 26.1.1 Version: 17.18.1a Version: 17.15.4a Version: 17.18.2 Version: 17.18.1w Version: 17.15.4b Version: 17.12.6a Version: 17.12.7 Version: 17.15.4c Version: 17.9.9 Version: 17.12.5d Version: 17.15.4s1 Version: 17.15.5 Version: 17.12.1z5 Version: 17.18.1x Version: 17.12.1z6 Version: 17.15.4d Version: 17.12.6b Version: 17.4.1c Version: 17.15.5a Version: 17.18.1y Version: 17.12.7a Version: 17.18.3 Version: 17.12.7b Version: 17.18.3a Version: 26.1.1a Version: 26.2.1ea |
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"value": "A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to insufficient error handling in the web-based management interface. An attacker could exploit this vulnerability by authenticating with a malformed certificate. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition."
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\"status\": \"affected\"}, {\"version\": \"17.12.6a\", \"status\": \"affected\"}, {\"version\": \"17.12.7\", \"status\": \"affected\"}, {\"version\": \"17.15.4c\", \"status\": \"affected\"}, {\"version\": \"17.9.9\", \"status\": \"affected\"}, {\"version\": \"17.12.5d\", \"status\": \"affected\"}, {\"version\": \"17.15.4s1\", \"status\": \"affected\"}, {\"version\": \"17.15.5\", \"status\": \"affected\"}, {\"version\": \"17.12.1z5\", \"status\": \"affected\"}, {\"version\": \"17.18.1x\", \"status\": \"affected\"}, {\"version\": \"17.12.1z6\", \"status\": \"affected\"}, {\"version\": \"17.15.4d\", \"status\": \"affected\"}, {\"version\": \"17.12.6b\", \"status\": \"affected\"}, {\"version\": \"17.4.1c\", \"status\": \"affected\"}, {\"version\": \"17.15.5a\", \"status\": \"affected\"}, {\"version\": \"17.18.1y\", \"status\": \"affected\"}, {\"version\": \"17.12.7a\", \"status\": \"affected\"}, {\"version\": \"17.18.3\", \"status\": \"affected\"}, {\"version\": \"17.12.7b\", \"status\": \"affected\"}, {\"version\": \"17.18.3a\", \"status\": \"affected\"}, {\"version\": \"26.1.1a\", \"status\": \"affected\"}, {\"version\": \"26.2.1ea\", \"status\": \"affected\"}], \"defaultStatus\": \"unknown\"}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-08-05T16:32:36.347Z\"}}, \"adp\": [{\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20311\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-05T17:35:57.539429Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-08-05T17:38:47.311Z\"}, \"title\": \"CISA ADP Vulnrichment\"}]}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20311\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"cisco\", \"dateReserved\": \"2025-10-08T11:59:15.409Z\", \"datePublished\": \"2026-08-05T16:32:36.347Z\", \"dateUpdated\": \"2026-08-05T16:32:36.347Z\"}",
"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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