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Exploited vulnerability · CISA KEV

Is CVE-2017-3881 exploited? Yes: in CISA KEV since 25 Mar 2022

Gociux · Cisco IOS and IOS XE · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2017-3881, Cisco IOS and IOS XE Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 25 Mar 2022, 1834 days after it was published. It affects Cisco IOS and IOS XE, 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 · 25 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due15 Apr 2022BOD 22-01 deadline

What it is

A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of an affected device or remotely execute code with elevated privileges.

VendorCisco (103 exploited CVEs in KEV)
ProductIOS and IOS XE
VulnerabilityCisco IOS and IOS XE Remote Code Execution Vulnerability
WeaknessCWE-20
Published17 Mar 2017
Added to KEV25 Mar 2022
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for IOS and IOS XE 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 17 Mar 2017.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in IOS and IOS XE

References

Questions

Is CVE-2017-3881 being exploited?

Yes. CISA added CVE-2017-3881 to the Known Exploited Vulnerabilities catalog on 25 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2017-3881 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-2017-3881?

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 IOS and IOS XE 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 March 2022 · Cisco scorecard · act-now radar.

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