CVE-2026-20349
HIGHCISA KEVEPSS 81th pctlDescription
A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
How to fix
Actively exploited, no published fix found yet
Federal remediation due: 2026-08-14
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Exploit Intelligence
Elevated risk: more likely to be exploited than 81% of all known CVEs.
Remediation due: 2026-08-14
References
Related Vulnerabilities
Other CWE-244 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-20943 | Medium | 5.8 | 0.9% | - | Fix |
| CVE-2022-20922 | Medium | 5.8 | 0.8% | - | - |
| CVE-2023-20070 | Medium | 4.0 | 0.5% | - | - |
| CVE-2023-20177 | Medium | 4.0 | 0.5% | - | - |
| CVE-2025-5105 | High | 7.3 | 0.4% | - | - |
| CVE-2025-26305 | High | 8.2 | 0.4% | - | - |
Common questions
How do I fix CVE-2026-20349?
No published fix for CVE-2026-20349 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2026-08-14. Apply the vendor's mitigations per CISA's guidance.
Is CVE-2026-20349 being actively exploited?
Yes. CVE-2026-20349 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-08-14. Treat it as a priority whatever its CVSS score says.
How severe is CVE-2026-20349?
CVE-2026-20349 has a CVSS v3 base score of 8.6, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-12.