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Exploited vulnerability · CISA KEV

Is CVE-2016-6366 exploited? Yes: in CISA KEV since 24 May 2022

Gociux · Cisco Adaptive Security Appliance (ASA) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2016-6366, Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 24 May 2022, 2105 days after it was published. It affects Cisco Adaptive Security Appliance (ASA), an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 24 May 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity8.8CVSS 3.1 · high
US federal due14 Jun 2022BOD 22-01 deadline

What it is

A buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) code of Cisco ASA software could allow an attacker to cause a reload of the affected system or to remotely execute code.

VendorCisco (103 exploited CVEs in KEV)
ProductAdaptive Security Appliance (ASA)
VulnerabilityCisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability
WeaknessCWE-119
Published18 Aug 2016
Added to KEV24 May 2022
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for Adaptive Security Appliance (ASA) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  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 18 Aug 2016.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in Adaptive Security Appliance (ASA)

References

Questions

Is CVE-2016-6366 being exploited?

Yes. CISA added CVE-2016-6366 to the Known Exploited Vulnerabilities catalog on 24 May 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2016-6366 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2016-6366?

Apply updates per vendor instructions. Check Cisco's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Adaptive Security Appliance (ASA) and watch it for signs of compromise.

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 May 2022 · Cisco scorecard · act-now radar.

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