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Exploited vulnerability · CISA KEV

Is CVE-2019-15271 exploited? Yes: in CISA KEV since 8 Jun 2022

Gociux · Cisco RV Series Routers · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-15271, Cisco RV Series Routers Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 8 Jun 2022, 925 days after it was published. It affects Cisco RV Series Routers, 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 · 8 Jun 2022
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity8.8CVSS 3.0 · high
US federal due22 Jun 2022BOD 22-01 deadline

What it is

A deserialization of untrusted data vulnerability in the web-based management interface of certain Cisco Small Business RV Series Routers could allow an attacker to execute code with root privileges.

VendorCisco (103 exploited CVEs in KEV)
ProductRV Series Routers
VulnerabilityCisco RV Series Routers Deserialization of Untrusted Data Vulnerability
WeaknessCWE-502
Published26 Nov 2019
Added to KEV8 Jun 2022
Reported by (CNA)cisco

What to do

  1. Check whether you run it. Look for RV Series Routers 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 Nov 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

References

Questions

Is CVE-2019-15271 being exploited?

Yes. CISA added CVE-2019-15271 to the Known Exploited Vulnerabilities catalog on 8 Jun 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-15271 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-2019-15271?

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 RV Series Routers 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 June 2022 · Cisco scorecard · act-now radar.

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