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Exploited vulnerability · CISA KEV

Is CVE-2020-3118 exploited? Yes: in CISA KEV since 3 Nov 2021

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

Yes. CVE-2020-3118, Cisco IOS XR Software Discovery Protocol Format String Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 637 days after it was published. It affects Cisco IOS XR. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity8.8CVSS 3.0 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

Cisco IOS XR improperly validates string input from certain fields in Cisco Discovery Protocol messages. Exploitation could allow an unauthenticated, adjacent attacker to execute code with administrative privileges or cause a reload on an affected device.

VendorCisco (103 exploited CVEs in KEV)
ProductIOS XR
VulnerabilityCisco IOS XR Software Discovery Protocol Format String Vulnerability
WeaknessCWE-134
Published5 Feb 2020
Added to KEV3 Nov 2021
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for IOS XR 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 5 Feb 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in IOS XR

References

Questions

Is CVE-2020-3118 being exploited?

Yes. CISA added CVE-2020-3118 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-3118 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-2020-3118?

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 XR 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 November 2021 · Cisco scorecard · act-now radar.

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