CVE-2023-20269
CISA KEVPublished September 13, 2023 · Updated April 3, 2026
high
Official Description+
Cisco Adaptive Security Appliance and Firepower Threat Defense contain an unauthorized access vulnerability that could allow an unauthenticated, remote attacker to conduct a brute force attack in an attempt to identify valid username and password combinations or establish a clientless SSL VPN session with an unauthorized user.
Affected Products
| Vendor | Product |
|---|---|
| Cisco | Adaptive Security Appliance and Firepower Threat Defense |
Patch Status
Patch by 2023-10-04
Recommended Actions
- Check if your systems use any of the affected products listed above.
- Apply vendor patches immediately if available.
- This vulnerability is in CISA's Known Exploited Vulnerabilities catalog — prioritize remediation.
- Monitor vendor advisories for updates and additional mitigations.
- Review logs for indicators of compromise related to CVE-2023-20269.