Exploited vulnerability · CISA KEV

Is CVE-2023-20269 exploited? Yes: in CISA KEV since 13 Sep 2023

Gociux · Cisco Adaptive Security Appliance and Firepower Threat Defense · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-20269, Cisco Adaptive Security Appliance and Firepower Threat Defense Unauthorized Access Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 13 Sep 2023, 7 days after it was published. It is known to be used in ransomware campaigns. It affects Cisco Adaptive Security Appliance and Firepower Threat Defense, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations per vendor instructions for group-lock and vpn-simultaneous-logins or discontinue use of the product for unsupported devices.

What it is

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.

What to do

1. Check whether you run it. Look for Adaptive Security Appliance and Firepower Threat Defense in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
2. Apply the fix. Apply mitigations per vendor instructions for group-lock and vpn-simultaneous-logins or discontinue use of the product for unsupported devices.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 6 Sep 2023.
4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

References

• sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaf
• nvd.nist.gov/vuln/detail/CVE-2023-20269

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in September 2023 · Cisco scorecard · act-now radar.