CVE-2025-20363: cisco adaptive_security_appliance_software Heap-based Buffer Overflow
Vulnerability summary
CVE-2025-20363 is a critical (CVSS 9.0) Heap-based Buffer Overflow vulnerability in cisco adaptive_security_appliance_software. EPSS estimates a 6.92% chance of exploitation in the next 30 days, higher than 94% of scored vulnerabilities.
Timeline
- 25-09-2025PublishedVulnerability first disclosed.
- 26-02-2026Last modifiedVulnerability information updated.
Description
A vulnerability in the web services of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, remote attacker (Cisco ASA and FTD Software) or authenticated, remote attacker (Cisco IOS, IOS XE, and IOS XR Software) with low user privileges to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web service on an affected device after obtaining additional information about the system, overcoming exploit mitigations, or both. A successful exploit could allow the attacker to execute arbitrary code as root, which may lead to the complete compromise of the affected device. For more information about this vulnerability, see the Details ["#details"] section of this advisory.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST9.0CriticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
6.92%
Chance of exploitation in the next 30 days
Percentile
94%
Versus all other CVEs
30-day change
0.00 pp
From 6.92% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Cisco9 products
- adaptive_security_appliance_software≥ 9.12, < 9.12.4.72 | ≥ 9.14, < 9.14.4.28 | ≥ 9.16, < 9.16.4.84 | ≥ 9.17.1, < 9.18.4.57 | ≥ 9.19.1, < 9.19.1.42 | ≥ 9.20.1, < 9.20.3.16 | ≥ 9.22, < 9.22.2 | ≥ 9.23, < 9.23.1.3
- cisco adaptive security appliance (asa) software9.8.1 | 9.8.1.5 | 9.8.1.7 | 9.8.2 | 9.8.2.8 | 9.8.2.14 | 9.8.2.15 | 9.8.2.17 | 9.8.2.20 | 9.8.2.24 | 9.8.2.26 | 9.8.2.28 | 9.8.2.33 | 9.8.2.35 | 9.8.2.38 | 9.8.3.8 | 9.8.3.11 | 9.8.3.14 | 9.8.3.16 | 9.8.3.18 | 9.8.3.21 | 9.8.3 | 9.8.3.26 | 9.8.3.29 | 9.8.4 | 9.8.4.3 | 9.8.4.7 | 9.8.4.8 | 9.8.4.10 | 9.8.4.12 | 9.8.4.15 | 9.8.4.17 | 9.8.2.45 | 9.8.4.25 | 9.8.4.20 | 9.8.4.22 | 9.8.4.26 | 9.8.4.29 | 9.8.4.32 | 9.8.4.33 | 9.8.4.34 | 9.8.4.35 | 9.8.4.39 | 9.8.4.40 | 9.8.4.41 | 9.8.4.43 | 9.8.4.44 | 9.8.4.45 | 9.8.4.46 | 9.8.4.48 | 9.12.1 | 9.12.1.2 | 9.12.1.3 | 9.12.2 | 9.12.2.4 | 9.12.2.5 | 9.12.2.9 | 9.12.3 | 9.12.3.2 | 9.12.3.7 | 9.12.4 | 9.12.3.12 | 9.12.3.9 | 9.12.2.1 | 9.12.4.2 | 9.12.4.4 | 9.12.4.7 | 9.12.4.10 | 9.12.4.13 | 9.12.4.8 | 9.12.4.18 | 9.12.4.24 | 9.12.4.26 | 9.12.4.29 | 9.12.4.30 | 9.12.4.35 | 9.12.4.37 | 9.12.4.38 | 9.12.4.39 | 9.12.4.40 | 9.12.4.41 | 9.12.4.47 | 9.12.4.48 | 9.12.4.50 | 9.12.4.52 | 9.12.4.54 | 9.12.4.55 | 9.12.4.56 | 9.12.4.58 | 9.12.4.62 | 9.12.4.65 | 9.12.4.67 | 9.14.1 | 9.14.1.10 | 9.14.1.6 | 9.14.1.15 | 9.14.1.19 | 9.14.1.30 | 9.14.2 | 9.14.2.4 | 9.14.2.8 | 9.14.2.13 | 9.14.2.15 | 9.14.3 | 9.14.3.1 | 9.14.3.9 | 9.14.3.11 | 9.14.3.13 | 9.14.3.18 | 9.14.3.15 | 9.14.4 | 9.14.4.6 | 9.14.4.7 | 9.14.4.12 | 9.14.4.13 | 9.14.4.14 | 9.14.4.15 | 9.14.4.17 | 9.14.4.22 | 9.14.4.23 | 9.14.4.24 | 9.16.1 | 9.16.1.28 | 9.16.2 | 9.16.2.3 | 9.16.2.7 | 9.16.2.11 | 9.16.2.13 | 9.16.2.14 | 9.16.3 | 9.16.3.3 | 9.16.3.14 | 9.16.3.15 | 9.16.3.19 | 9.16.3.23 | 9.16.4 | 9.16.4.9 | 9.16.4.14 | 9.16.4.18 | 9.16.4.19 | 9.16.4.27 | 9.16.4.38 | 9.16.4.39 | 9.16.4.42 | 9.16.4.48 | 9.16.4.55 | 9.16.4.57 | 9.16.4.61 | 9.16.4.62 | 9.16.4.67 | 9.16.4.70 | 9.16.4.71 | 9.16.4.76 | 9.16.4.82 | 9.17.1 | 9.17.1.7 | 9.17.1.9 | 9.17.1.10 | 9.17.1.11 | 9.17.1.13 | 9.17.1.15 | 9.17.1.20 | 9.17.1.30 | 9.17.1.33 | 9.17.1.39 | 9.17.1.45 | 9.17.1.46 | 9.18.1 | 9.18.1.3 | 9.18.2 | 9.18.2.5 | 9.18.2.7 | 9.18.2.8 | 9.18.3 | 9.18.3.39 | 9.18.3.46 | 9.18.3.53 | 9.18.3.55 | 9.18.3.56 | 9.18.4 | 9.18.4.5 | 9.18.4.8 | 9.18.4.22 | 9.18.4.24 | 9.18.4.29 | 9.18.4.34 | 9.18.4.40 | 9.18.4.47 | 9.18.4.50 | 9.18.4.52 | 9.18.4.53 | 9.19.1 | 9.19.1.5 | 9.19.1.9 | 9.19.1.12 | 9.19.1.18 | 9.19.1.22 | 9.19.1.24 | 9.19.1.27 | 9.19.1.28 | 9.19.1.31 | 9.19.1.37 | 9.19.1.38 | 9.20.1 | 9.20.1.5 | 9.20.2 | 9.20.2.10 | 9.20.2.21 | 9.20.2.22 | 9.20.3 | 9.20.3.4 | 9.20.3.7 | 9.20.3.9 | 9.20.3.10 | 9.20.3.13 | 9.22.1.1 | 9.22.1.3 | 9.22.1.2 | 9.22.1.6 | 9.23.1
- cisco firepower threat defense software6.2.3 | 6.2.3.1 | 6.2.3.2 | 6.2.3.3 | 6.2.3.4 | 6.2.3.5 | 6.2.3.6 | 6.2.3.7 | 6.2.3.8 | 6.2.3.10 | 6.2.3.11 | 6.2.3.9 | 6.2.3.12 | 6.2.3.13 | 6.2.3.14 | 6.2.3.15 | 6.2.3.16 | 6.2.3.17 | 6.2.3.18 | 6.6.0 | 6.6.0.1 | 6.6.1 | 6.6.3 | 6.6.4 | 6.6.5 | 6.6.5.1 | 6.6.5.2 | 6.6.7 | 6.6.7.1 | 6.6.7.2 | 6.4.0 | 6.4.0.1 | 6.4.0.3 | 6.4.0.2 | 6.4.0.4 | 6.4.0.5 | 6.4.0.6 | 6.4.0.7 | 6.4.0.8 | 6.4.0.9 | 6.4.0.10 | 6.4.0.11 | 6.4.0.12 | 6.4.0.13 | 6.4.0.14 | 6.4.0.15 | 6.4.0.16 | 6.4.0.17 | 6.4.0.18 | 7.0.0 | 7.0.0.1 | 7.0.1 | 7.0.1.1 | 7.0.2 | 7.0.2.1 | 7.0.3 | 7.0.4 | 7.0.5 | 7.0.6 | 7.0.6.1 | 7.0.6.2 | 7.0.6.3 | 7.0.7 | 7.1.0 | 7.1.0.1 | 7.1.0.2 | 7.1.0.3 | 7.2.0 | 7.2.0.1 | 7.2.1 | 7.2.2 | 7.2.3 | 7.2.4 | 7.2.4.1 | 7.2.5 | 7.2.5.1 | 7.2.6 | 7.2.7 | 7.2.5.2 | 7.2.8 | 7.2.8.1 | 7.2.9 | 7.3.0 | 7.3.1 | 7.3.1.1 | 7.3.1.2 | 7.4.0 | 7.4.1 | 7.4.1.1 | 7.4.2 | 7.4.2.1 | 7.4.2.2 | 7.6.0 | 7.7.0
- cisco ios xe software3.2.0SG | 3.2.1SG | 3.2.2SG | 3.2.3SG | 3.2.4SG | 3.2.5SG | 3.2.6SG | 3.2.7SG | 3.2.8SG | 3.2.9SG | 3.2.10SG | 3.2.11SG | 3.7.0S | 3.7.1S | 3.7.2S | 3.7.3S | 3.7.4S | 3.7.5S | 3.7.6S | 3.7.7S | 3.7.4aS | 3.7.2tS | 3.7.0bS | 3.7.1aS | 3.3.0SG | 3.3.2SG | 3.3.1SG | 3.8.0S | 3.8.1S | 3.8.2S | 3.9.1S | 3.9.0S | 3.9.2S | 3.9.1aS | 3.9.0aS | 3.2.0SE | 3.2.1SE | 3.2.2SE | 3.2.3SE | 3.3.0SE | 3.3.1SE | 3.3.2SE | 3.3.3SE | 3.3.4SE | 3.3.5SE | 3.4.0SG | 3.4.2SG | 3.4.1SG | 3.4.3SG | 3.4.4SG | 3.4.5SG | 3.4.6SG | 3.4.7SG | 3.4.8SG | 3.5.0E | 3.5.1E | 3.5.2E | 3.5.3E | 3.11.1S | 3.11.2S | 3.11.0S | 3.11.3S | 3.11.4S | 3.12.0S | 3.12.1S | 3.12.2S | 3.12.3S | 3.12.0aS | 3.12.4S | 3.13.0S | 3.13.1S | 3.13.2S | 3.13.3S | 3.13.4S | 3.13.5S | 3.13.2aS | 3.13.0aS | 3.13.5aS | 3.13.6S | 3.13.7S | 3.13.6aS | 3.13.7aS | 3.13.8S | 3.13.9S | 3.13.10S | 3.6.0E | 3.6.1E | 3.6.2aE | 3.6.2E | 3.6.3E | 3.6.4E | 3.6.5E | 3.6.6E | 3.6.5aE | 3.6.5bE | 3.6.7E | 3.6.8E | 3.6.7bE | 3.6.9E | 3.6.10E | 3.14.0S | 3.14.1S | 3.14.2S | 3.14.3S | 3.14.4S | 3.15.0S | 3.15.1S | 3.15.2S | 3.15.1cS | 3.15.3S | 3.15.4S | 3.3.0SQ | 3.3.1SQ | 3.4.0SQ | 3.4.1SQ | 3.7.0E | 3.7.1E | 3.7.2E | 3.7.3E | 3.7.4E | 3.7.5E | 3.5.0SQ | 3.5.1SQ | 3.5.2SQ | 3.5.3SQ | 3.5.4SQ | 3.5.5SQ | 3.5.6SQ | 3.5.7SQ | 3.5.8SQ | 3.16.0S | 3.16.1S | 3.16.1aS | 3.16.2S | 3.16.2aS | 3.16.0cS | 3.16.3S | 3.16.2bS | 3.16.3aS | 3.16.4S | 3.16.4aS | 3.16.4bS | 3.16.5S | 3.16.4dS | 3.16.6S | 3.16.7S | 3.16.6bS | 3.16.7aS | 3.16.7bS | 3.16.8S | 3.16.9S | 3.16.10S | 3.17.0S | 3.17.1S | 3.17.2S | 3.17.1aS | 3.17.3S | 3.17.4S | 16.1.1 | 16.1.2 | 16.1.3 | 16.2.1 | 16.2.2 | 3.8.0E | 3.8.1E | 3.8.2E | 3.8.3E | 3.8.4E | 3.8.5E | 3.8.5aE | 3.8.6E | 3.8.7E | 3.8.8E | 3.8.9E | 3.8.10E | 16.3.1 | 16.3.2 | 16.3.3 | 16.3.1a | 16.3.4 | 16.3.5 | 16.3.5b | 16.3.6 | 16.3.7 | 16.3.8 | 16.3.9 | 16.3.10 | 16.3.11 | 16.4.1 | 16.4.2 | 16.4.3 | 16.5.1 | 16.5.1a | 16.5.1b | 16.5.2 | 16.5.3 | 3.18.0aS | 3.18.0S | 3.18.1S | 3.18.2S | 3.18.3S | 3.18.4S | 3.18.0SP | 3.18.1SP | 3.18.1aSP | 3.18.1bSP | 3.18.1cSP | 3.18.2SP | 3.18.2aSP | 3.18.3SP | 3.18.4SP | 3.18.3aSP | 3.18.3bSP | 3.18.5SP | 3.18.6SP | 3.18.7SP | 3.18.8aSP | 3.18.9SP | 3.9.0E | 3.9.1E | 3.9.2E | 16.6.1 | 16.6.2 | 16.6.3 | 16.6.4 | 16.6.5 | 16.6.4a | 16.6.5a | 16.6.6 | 16.6.7 | 16.6.8 | 16.6.9 | 16.6.10 | 16.7.1 | 16.7.1a | 16.7.1b | 16.7.2 | 16.7.3 | 16.7.4 | 16.8.1 | 16.8.1a | 16.8.1b | 16.8.1s | 16.8.1c | 16.8.1d | 16.8.2 | 16.8.1e | 16.8.3 | 16.9.1 | 16.9.2 | 16.9.1a | 16.9.1b | 16.9.1s | 16.9.3 | 16.9.4 | 16.9.3a | 16.9.5 | 16.9.5f | 16.9.6 | 16.9.7 | 16.9.8 | 16.10.1 | 16.10.1a | 16.10.1b | 16.10.1s | 16.10.1c | 16.10.1e | 16.10.1d | 16.10.2 | 16.10.1f | 16.10.1g | 16.10.3 | 3.10.0E | 3.10.1E | 3.10.0cE | 3.10.2E | 3.10.3E | 16.11.1 | 16.11.1a | 16.11.1b | 16.11.2 | 16.11.1s | 16.12.1 | 16.12.1s | 16.12.1a | 16.12.1c | 16.12.1w | 16.12.2 | 16.12.1y | 16.12.2a | 16.12.3 | 16.12.8 | 16.12.2s | 16.12.1x | 16.12.1t | 16.12.4 | 16.12.3s | 16.12.3a | 16.12.4a | 16.12.5 | 16.12.6 | 16.12.1z1 | 16.12.5a | 16.12.5b | 16.12.1z2 | 16.12.6a | 16.12.7 | 16.12.9 | 16.12.10 | 16.12.10a | 16.12.11 | 16.12.12 | 16.12.13 | 3.11.0E | 3.11.1E | 3.11.2E | 3.11.3E | 3.11.1aE | 3.11.4E | 3.11.3aE | 3.11.5E | 3.11.6E | 3.11.7E | 3.11.8E | 3.11.9E | 3.11.10E | 3.11.11E | 3.11.12E | 17.1.1 | 17.1.1a | 17.1.1s | 17.1.1t | 17.1.3 | 17.2.1 | 17.2.1r | 17.2.1a | 17.2.1v | 17.2.2 | 17.2.3 | 17.3.1 | 17.3.2 | 17.3.3 | 17.3.1a | 17.3.1w | 17.3.2a | 17.3.1x | 17.3.1z | 17.3.4 | 17.3.5 | 17.3.4a | 17.3.6 | 17.3.4b | 17.3.4c | 17.3.5a | 17.3.5b | 17.3.7 | 17.3.8 | 17.3.8a | 17.4.1 | 17.4.2 | 17.4.1a | 17.4.1b | 17.4.2a | 17.5.1 | 17.5.1a | 17.6.1 | 17.6.2 | 17.6.1w | 17.6.1a | 17.6.1x | 17.6.3 | 17.6.1y | 17.6.1z | 17.6.3a | 17.6.4 | 17.6.1z1 | 17.6.5 | 17.6.6 | 17.6.6a | 17.6.5a | 17.6.7 | 17.6.8 | 17.6.8a | 17.7.1 | 17.7.1a | 17.7.1b | 17.7.2 | 17.10.1 | 17.10.1a | 17.10.1b | 17.8.1 | 17.8.1a | 17.9.1 | 17.9.1w | 17.9.2 | 17.9.1a | 17.9.1x | 17.9.1y | 17.9.3 | 17.9.2a | 17.9.1x1 | 17.9.3a | 17.9.4 | 17.9.1y1 | 17.9.5 | 17.9.4a | 17.9.5a | 17.9.5b | 17.9.6 | 17.9.6a | 17.9.7 | 17.9.5e | 17.9.5f | 17.9.7b | 17.11.1 | 17.11.1a | 17.12.1 | 17.12.1w | 17.12.1a | 17.12.1x | 17.12.2 | 17.12.3 | 17.12.2a | 17.12.1y | 17.12.1z | 17.12.4 | 17.12.3a | 17.12.1z1 | 17.12.1z2 | 17.12.4a | 17.12.5 | 17.12.4b | 17.12.1z3 | 17.12.5a | 17.12.1z4 | 17.12.5c | 17.13.1 | 17.13.1a | 17.14.1 | 17.14.1a | 17.11.99SW | 17.15.1 | 17.15.1w | 17.15.1a | 17.15.2 | 17.15.1b | 17.15.1x | 17.15.1z | 17.15.3 | 17.15.2c | 17.15.2a | 17.15.1y | 17.15.2b | 17.16.1 | 17.16.1a | 17.17.1
- cisco ios xr software6.5.1 | 6.5.2 | 6.5.3 | 6.6.2 | 6.6.3 | 6.6.25 | 6.7.1 | 6.7.2 | 6.7.3 | 6.8.1 | 6.8.2 | 6.9.1 | 6.9.2
1 vendor · 9 products
References
1 links- sec.cloudapps.cisco.com/security/…Vendor Advisory