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Exploited vulnerability · CISA KEV

Is CVE-2017-12232 exploited? Yes: in CISA KEV since 3 Mar 2022

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

Yes. CVE-2017-12232, Cisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Mar 2022, 1617 days after it was published. It affects Cisco IOS software. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Mar 2022
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity6.5CVSS 3.1 · medium
US federal due24 Mar 2022BOD 22-01 deadline

What it is

A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service.

VendorCisco (103 exploited CVEs in KEV)
ProductIOS software
VulnerabilityCisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Vulnerability
WeaknessCWE-399
Published28 Sep 2017
Added to KEV3 Mar 2022
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for IOS software 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 28 Sep 2017.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in IOS software

References

Questions

Is CVE-2017-12232 being exploited?

Yes. CISA added CVE-2017-12232 to the Known Exploited Vulnerabilities catalog on 3 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2017-12232 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-2017-12232?

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 software 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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