CVE-2026-20023 (GCVE-0-2026-20023)
Vulnerability from cvelistv5
Published
2026-03-04 18:35
Modified
2026-03-04 21:34
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-787 - Out-of-bounds Write
Summary
A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to corrupt memory on an affected device, resulting in a denial of service (DoS) condition.
This vulnerability is due to memory corruption when parsing OSPF protocol packets. An attacker could exploit this vulnerability by sending crafted OSPF packets to an affected device. A successful exploit could allow the attacker to cause memory corruption causing the affected device to reboot, resulting in a DoS condition.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software |
Version: 9.12.1 Version: 9.12.1.2 Version: 9.12.1.3 Version: 9.12.2 Version: 9.12.2.4 Version: 9.12.2.5 Version: 9.12.2.9 Version: 9.12.3 Version: 9.12.3.2 Version: 9.12.3.7 Version: 9.12.4 Version: 9.12.3.12 Version: 9.12.3.9 Version: 9.12.2.1 Version: 9.12.4.2 Version: 9.12.4.4 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: 9.16.4.85 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: 9.18.4.66 Version: 9.18.4.67 Version: 9.18.4.68 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: 9.20.4 Version: 9.20.4.7 Version: 9.20.4.10 Version: 9.20.4.14 Version: 9.22.1.1 Version: 9.22.1.3 Version: 9.22.1.2 Version: 9.22.1.6 Version: 9.22.2.9 Version: 9.22.2.13 Version: 9.22.2.14 Version: 9.23.1 Version: 9.23.1.7 Version: 9.23.1.13 Version: 9.23.1.19 Version: 9.23.1.22 |
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{
"status": "affected",
"version": "7.4.1.1"
},
{
"status": "affected",
"version": "7.4.2"
},
{
"status": "affected",
"version": "7.4.2.1"
},
{
"status": "affected",
"version": "7.4.2.2"
},
{
"status": "affected",
"version": "7.4.2.3"
},
{
"status": "affected",
"version": "7.4.2.4"
},
{
"status": "affected",
"version": "7.4.3"
},
{
"status": "affected",
"version": "7.6.0"
},
{
"status": "affected",
"version": "7.6.1"
},
{
"status": "affected",
"version": "7.6.2"
},
{
"status": "affected",
"version": "7.6.2.1"
},
{
"status": "affected",
"version": "7.7.0"
},
{
"status": "affected",
"version": "7.7.10.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to corrupt memory on an affected device, resulting in a denial of service (DoS) condition.\r\n\r This vulnerability is due to memory corruption when parsing OSPF protocol packets. An attacker could exploit this vulnerability by sending crafted OSPF packets to an affected device. A successful exploit could allow the attacker to cause memory corruption causing the affected device to reboot, resulting in a DoS condition."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-787",
"description": "Out-of-bounds Write",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-04T18:35:35.358Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-asaftd-ospf-ZH8PhbSW",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ospf-ZH8PhbSW"
}
],
"source": {
"advisory": "cisco-sa-asaftd-ospf-ZH8PhbSW",
"defects": [
"CSCwq73656"
],
"discovery": "INTERNAL"
}
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20023",
"datePublished": "2026-03-04T18:35:35.358Z",
"dateReserved": "2025-10-08T11:59:15.352Z",
"dateUpdated": "2026-03-04T21:34:39.881Z",
"state": "PUBLISHED"
},
"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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