9

CVE-2025-20363: cisco adaptive_security_appliance_software Heap-based Buffer Overflow

CVSS: 9.0v3.1CriticalAnalyzed
Published 25-09-2025Last modified 26-02-2026

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.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.0/10
010
Critical · v3.1 (CVE.org)
EPSS score
6.92%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 25-09-2025
    PublishedVulnerability first disclosed.
  2. 26-02-2026
    Last 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

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

19-09-202619-10-2026
EPSS score
6.92%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected 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