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Exploited vulnerability · CISA KEV

Is CVE-2021-35247 exploited? Yes: in CISA KEV since 21 Jan 2022

Gociux · SolarWinds Serv-U · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-35247, SolarWinds Serv-U Improper Input Validation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 21 Jan 2022, 14 days after it was published. It affects SolarWinds Serv-U. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 21 Jan 2022
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity4.3CVSS 3.1 · medium
US federal due4 Feb 2022BOD 22-01 deadline

What it is

SolarWinds Serv-U versions 15.2.5 and earlier contain an improper input validation vulnerability that allows attackers to build and send queries without sanitization.

VendorSolarWinds (11 exploited CVEs in KEV)
ProductServ-U
VulnerabilitySolarWinds Serv-U Improper Input Validation Vulnerability
WeaknessCWE-20
Published7 Jan 2022
Added to KEV21 Jan 2022
Reported by (CNA)SolarWinds

What to do

  1. Check whether you run it. Look for Serv-U in your asset inventory, including appliances and cloud images. Stack check lists every exploited SolarWinds 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 7 Jan 2022.
  4. Get told next time. Email alerts when CISA adds a CVE for SolarWinds.

Other exploited CVEs in Serv-U

References

Questions

Is CVE-2021-35247 being exploited?

Yes. CISA added CVE-2021-35247 to the Known Exploited Vulnerabilities catalog on 21 Jan 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-35247 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-2021-35247?

Apply updates per vendor instructions. Check SolarWinds's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Serv-U 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 January 2022 · SolarWinds scorecard · act-now radar.

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