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Exploited vulnerability · CISA KEV

Is CVE-2022-20821 exploited? Yes: in CISA KEV since 23 May 2022

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

Yes. CVE-2022-20821, Cisco IOS XR Open Port Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 23 May 2022. It affects Cisco IOS XR. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 23 May 2022
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity6.5CVSS 3.1 · medium
US federal due13 Jun 2022BOD 22-01 deadline

What it is

Cisco IOS XR software health check opens TCP port 6379 by default on activation. An attacker can connect to the Redis instance on the open port and allow access to the Redis instance that is running within the NOSi container.

VendorCisco (103 exploited CVEs in KEV)
ProductIOS XR
VulnerabilityCisco IOS XR Open Port Vulnerability
WeaknessCWE-923
Published26 May 2022
Added to KEV23 May 2022
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 26 May 2022.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in IOS XR

References

Questions

Is CVE-2022-20821 being exploited?

Yes. CISA added CVE-2022-20821 to the Known Exploited Vulnerabilities catalog on 23 May 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2022-20821 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-2022-20821?

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 May 2022 · Cisco scorecard · act-now radar.

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