8.8

CVE-2026-20336: cisco cisco secure firewall adaptive security appliance (asa) software

CVSS: 8.8v3.1HighAwaiting analysis
Published 16-09-2026Last modified 18-09-2026
Open JSON

Vulnerability summary

CVE-2026-20336 is a high (CVSS 8.8) vulnerability in cisco cisco secure firewall adaptive security appliance (asa) software. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 8.7% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.20%
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. 16-09-2026
    PublishedVulnerability first disclosed.
  2. 18-09-2026
    Last modifiedVulnerability information updated.

Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense Software and Cisco Secure Firewall Management Center Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20336 are related to issues concerning improper control of a resource through its lifetime that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-664.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

0.00 pp

From 0.20% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.20%

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

Cisco3 products
  • cisco secure firewall adaptive security appliance (asa) software9.16.1 | 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 | 9.16.3.3 | 9.16.3 | 9.16.3.14 | 9.16.3.15 | 9.18.1.3 | 9.18.2 | 9.16.3.19 | 9.16.3.23 | 9.18.2.5 | 9.16.4 | 9.18.2.7 | 9.16.4.9 | 9.18.2.8 | 9.16.4.14 | 9.18.3 | 9.16.4.18 | 9.18.3.39 | 9.16.4.19 | 9.18.3.46 | 9.16.4.27 | 9.18.3.53 | 9.18.3.55 | 9.16.4.38 | 9.16.4.39 | 9.18.3.56 | 9.20.1 | 9.16.4.42 | 9.18.4 | 9.20.1.5 | 9.18.4.5 | 9.16.4.48 | 9.18.4.8 | 9.20.2 | 9.16.4.55 | 9.18.4.22 | 9.20.2.10 | 9.16.4.57 | 9.18.4.24 | 9.20.2.21 | 9.16.4.61 | 9.18.4.29 | 9.20.2.22 | 9.16.4.62 | 9.18.4.34 | 9.20.3 | 9.16.4.67 | 9.16.4.70 | 9.18.4.40 | 9.23.1 | 9.22.1.1 | 9.16.4.71 | 9.20.3.4 | 9.18.4.47 | 9.20.3.7 | 9.16.4.76 | 9.20.3.9 | 9.18.4.50 | 9.22.1.3 | 9.20.3.10 | 9.22.1.2 | 9.18.4.52 | 9.20.3.13 | 9.22.1.6 | 9.18.4.53 | 9.16.4.82 | 9.22.2 | 9.20.3.16 | 9.19.1.42 | 9.18.4.57 | 9.16.4.84 | 9.23.1.3 | 9.20.3.20 | 9.22.2.4 | 9.23.1.7 | 9.20.4 | 9.22.2.9 | 9.23.1.13 | 9.20.4.7 | 9.22.2.13 | 9.18.4.66 | 9.20.4.10 | 9.23.1.19 | 9.16.4.85 | 9.22.2.14 | 9.18.4.67 | 9.24.1 | 9.18.4.68 | 9.23.1.22 | 9.20.4.14 | 9.22.2.20 | 9.18.4.71 | 9.20.4.19 | 9.23.1.26 | 9.16.4.89 | 9.22.2.32 | 9.18.4.76 | 9.22.3 | 9.24.1.5 | 9.20.4.22 | 9.24.1.9 | 9.20.4.28 | 9.22.3.5 | 9.16.4.92 | 9.18.4.135 | 9.23.1.195 | 9.20.4.30 | 9.24.1.155 | 9.23.1.32 | 9.24.1.11 | 9.20.4.34 | 9.18.4.82 | 9.24.10 | 9.20.4.235
  • cisco secure firewall management center (fmc)7.0.0 | 7.0.0.1 | 7.0.1 | 7.0.1.1 | 7.0.2 | 7.2.0 | 7.0.2.1 | 7.0.3 | 7.2.0.1 | 7.0.4 | 7.2.1 | 7.0.5 | 7.3.0 | 7.2.2 | 7.3.1 | 7.2.3 | 7.2.3.1 | 7.2.4 | 7.0.6 | 7.2.4.1 | 7.2.5 | 7.3.1.1 | 7.4.0 | 7.0.6.1 | 7.2.5.1 | 7.4.1 | 7.2.6 | 7.4.1.1 | 7.0.6.2 | 7.2.7 | 7.2.5.2 | 7.3.1.2 | 7.2.8 | 7.6.0 | 7.4.2 | 7.2.8.1 | 7.0.6.3 | 7.4.2.1 | 7.2.9 | 7.0.7 | 7.7.0 | 7.4.2.2 | 7.2.10 | 7.6.1 | 7.4.2.3 | 7.0.8 | 7.6.2 | 7.7.10 | 7.2.10.1 | 7.0.8.1 | 7.6.2.1 | 7.2.10.2 | 7.7.10.1 | 7.4.2.4 | 7.4.3 | 7.6.3 | 7.7.11 | 7.6.4 | 10.0.0 | 7.4.4 | 7.4.5 | 7.0.9 | 7.2.11 | 7.7.12 | 7.6.5 | 7.4.6 | 10.0.1 | 7.4.7
  • cisco secure firewall threat defense (ftd) software7.0.0.1 | 7.0.1 | 7.0.1.1 | 7.0.2 | 7.0.2.1 | 7.0.3 | 7.0.4 | 7.0.5 | 7.3.0 | 7.3.1 | 7.0.6 | 7.3.1.1 | 7.4.0 | 7.0.6.1 | 7.4.1 | 7.0.6.2 | 7.4.1.1 | 7.3.1.2 | 7.6.0 | 7.4.2 | 7.0.6.3 | 7.4.2.1 | 7.0.7 | 7.7.0 | 7.4.2.2 | 7.6.1 | 7.4.2.3 | 7.0.8 | 7.6.2 | 7.7.10 | 7.7.11 | 7.0.8.1 | 7.6.2.1 | 7.7.10.1 | 7.4.2.4 | 7.4.3 | 7.6.4 | 10.0.0 | 7.4.4 | 7.0.9 | 7.4.7

1 vendor · 3 products

References

1 links