CVE-2026-20049 (GCVE-0-2026-20049)
Vulnerability from cvelistv5
Published
2026-03-04 17:22
Modified
2026-03-04 20:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-131 - Incorrect Calculation of Buffer Size
Summary
A vulnerability in the processing of Galois/Counter Mode (GCM)-encrypted Internet Key Exchange version 2 (IKEv2) IPsec traffic of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to the allocation of an insufficiently sized block of memory. An attacker could exploit this vulnerability by sending crafted GCM-encrypted IPsec traffic to an affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition. To exploit this vulnerability, the attacker must have valid credentials to establish a VPN connection with the affected device.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software |
Version: 9.12.4.7 Version: 9.12.4.10 Version: 9.12.4.13 Version: 9.12.4.8 Version: 9.12.4.18 Version: 9.12.4.24 Version: 9.12.4.26 Version: 9.12.4.29 Version: 9.12.4.30 Version: 9.12.4.35 Version: 9.12.4.37 Version: 9.12.4.38 Version: 9.12.4.39 Version: 9.12.4.40 Version: 9.12.4.41 Version: 9.12.4.47 Version: 9.12.4.48 Version: 9.12.4.50 Version: 9.12.4.52 Version: 9.12.4.54 Version: 9.12.4.55 Version: 9.12.4.56 Version: 9.12.4.58 Version: 9.12.4.62 Version: 9.12.4.65 Version: 9.12.4.67 Version: 9.16.1 Version: 9.16.1.28 Version: 9.16.2 Version: 9.16.2.3 Version: 9.16.2.7 Version: 9.16.2.11 Version: 9.16.2.13 Version: 9.16.2.14 Version: 9.16.3 Version: 9.16.3.3 Version: 9.16.3.14 Version: 9.16.3.15 Version: 9.16.3.19 Version: 9.16.3.23 Version: 9.16.4 Version: 9.16.4.9 Version: 9.16.4.14 Version: 9.16.4.19 Version: 9.16.4.27 Version: 9.16.4.38 Version: 9.16.4.39 Version: 9.16.4.42 Version: 9.16.4.48 Version: 9.16.4.55 Version: 9.16.4.57 Version: 9.16.4.61 Version: 9.16.4.62 Version: 9.16.4.67 Version: 9.16.4.70 Version: 9.16.4.71 Version: 9.16.4.76 Version: 9.16.4.82 Version: 9.16.4.84 Version: 9.17.1 Version: 9.17.1.7 Version: 9.17.1.9 Version: 9.17.1.10 Version: 9.17.1.11 Version: 9.17.1.13 Version: 9.17.1.15 Version: 9.17.1.20 Version: 9.17.1.30 Version: 9.17.1.33 Version: 9.17.1.39 Version: 9.17.1.45 Version: 9.17.1.46 Version: 9.18.1 Version: 9.18.1.3 Version: 9.18.2 Version: 9.18.2.5 Version: 9.18.2.7 Version: 9.18.2.8 Version: 9.18.3 Version: 9.18.3.39 Version: 9.18.3.46 Version: 9.18.3.53 Version: 9.18.3.55 Version: 9.18.3.56 Version: 9.18.4 Version: 9.18.4.5 Version: 9.18.4.8 Version: 9.18.4.22 Version: 9.18.4.24 Version: 9.18.4.29 Version: 9.18.4.34 Version: 9.18.4.40 Version: 9.18.4.47 Version: 9.18.4.50 Version: 9.18.4.52 Version: 9.18.4.53 Version: 9.18.4.57 Version: 9.19.1 Version: 9.19.1.5 Version: 9.19.1.9 Version: 9.19.1.12 Version: 9.19.1.18 Version: 9.19.1.22 Version: 9.19.1.24 Version: 9.19.1.27 Version: 9.19.1.28 Version: 9.19.1.31 Version: 9.19.1.37 Version: 9.19.1.38 Version: 9.19.1.42 Version: 9.20.1 Version: 9.20.1.5 Version: 9.20.2 Version: 9.20.2.10 Version: 9.20.2.21 Version: 9.20.2.22 Version: 9.20.3 Version: 9.20.3.4 Version: 9.20.3.7 Version: 9.20.3.9 Version: 9.20.3.10 Version: 9.20.3.13 Version: 9.20.3.16 Version: 9.20.3.20 Version: 9.22.1.1 Version: 9.22.1.3 Version: 9.22.1.2 Version: 9.22.1.6 Version: 9.22.2 Version: 9.23.1 Version: 9.23.1.3 |
|||||||
|
|||||||||
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"descriptions": [
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"lang": "en",
"value": "A vulnerability in the processing of Galois/Counter Mode (GCM)-encrypted Internet Key Exchange version 2 (IKEv2) IPsec traffic of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r This vulnerability is due to the allocation of an insufficiently sized block of memory. An attacker could exploit this vulnerability by sending crafted GCM-encrypted IPsec traffic to an affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition. To exploit this vulnerability, the attacker must have valid credentials to establish a VPN connection with the affected device."
}
],
"exploits": [
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"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."
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"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
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"cweId": "CWE-131",
"description": "Incorrect Calculation of Buffer Size",
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}
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"shortName": "cisco"
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"name": "cisco-sa-asaftd-esp-dos-uv7yD8P5",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-esp-dos-uv7yD8P5"
}
],
"source": {
"advisory": "cisco-sa-asaftd-esp-dos-uv7yD8P5",
"defects": [
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],
"discovery": "INTERNAL"
}
}
},
"cveMetadata": {
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"assignerShortName": "cisco",
"cveId": "CVE-2026-20049",
"datePublished": "2026-03-04T17:22:02.980Z",
"dateReserved": "2025-10-08T11:59:15.355Z",
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\"affected\", \"version\": \"7.7.0\"}, {\"status\": \"affected\", \"version\": \"7.7.10\"}, {\"status\": \"affected\", \"version\": \"7.7.10.1\"}]}], \"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-asaftd-esp-dos-uv7yD8P5\", \"name\": \"cisco-sa-asaftd-esp-dos-uv7yD8P5\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the processing of Galois/Counter Mode (GCM)-encrypted Internet Key Exchange version 2 (IKEv2) IPsec traffic of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\\r\\n\\r This vulnerability is due to the allocation of an insufficiently sized block of memory. An attacker could exploit this vulnerability by sending crafted GCM-encrypted IPsec traffic to an affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition. To exploit this vulnerability, the attacker must have valid credentials to establish a VPN connection with the affected device.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-131\", \"description\": \"Incorrect Calculation of Buffer Size\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-03-04T17:22:02.980Z\"}}}",
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}
}
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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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