CVE-2026-20329
CVE-2026-20329 is a critical-severity vulnerability with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-703.
Key facts
- Severity: Critical (CVSS 3.x base score 9.9)
- EPSS exploit prediction: 0% (38th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-703
- Published:
- Last modified:
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-2026-20329 are related to issues concerning improper handling of exceptional conditions that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-703.
Frequently asked questions
- What is CVE-2026-20329?
- 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-2026-20329 are related to issues concerning improper handling of exceptional conditions that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-703.
- How severe is CVE-2026-20329?
- CVE-2026-20329 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-20329 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-20329?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2026-20329 published?
- CVE-2026-20329 was published on 2026-09-16 and last updated on 2026-09-18.
References
Other CWE-703 vulnerabilities
- CVE-2025-13026 — Critical (CVSS 9.8): Sandbox escape due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in…
- CVE-2025-13023 — Critical (CVSS 9.8): Sandbox escape due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in…
- CVE-2025-13022 — Critical (CVSS 9.8): Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and…
- CVE-2025-13021 — Critical (CVSS 9.8): Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and…
- CVE-2026-71640 — Critical (CVSS 9.1): An issue in ZJU-FAST-Lab EGO-Planner-v2 All versions up to commit 5c99a95880401e2599638d567abc0e240396cb42 allows…
- CVE-2024-39815 — Critical (CVSS 9.1): Improper check or handling of exceptional conditions vulnerability affecting Vonets industrial wifi bridge relays…