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Exploited vulnerability · CISA KEV

Is CVE-2021-22204 exploited? Yes: in CISA KEV since 17 Nov 2021

Gociux · Perl Exiftool · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-22204, ExifTool Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 17 Nov 2021, 208 days after it was published. It affects Perl Exiftool. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 17 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity6.8CVSS 3.1 · medium
US federal due1 Dec 2021BOD 22-01 deadline

What it is

Improper neutralization of user data in the DjVu file format in Exiftool versions 7.44 and up allows arbitrary code execution when parsing the malicious image

VendorPerl (1 exploited CVE in KEV)
ProductExiftool
VulnerabilityExifTool Remote Code Execution Vulnerability
WeaknessCWE-95
Published23 Apr 2021
Added to KEV17 Nov 2021
Reported by (CNA)GitLab

What to do

  1. Check whether you run it. Look for Exiftool in your asset inventory, including appliances and cloud images. Stack check lists every exploited Perl 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 23 Apr 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for Perl.

References

Questions

Is CVE-2021-22204 being exploited?

Yes. CISA added CVE-2021-22204 to the Known Exploited Vulnerabilities catalog on 17 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-22204 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-2021-22204?

Apply updates per vendor instructions. Check Perl's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Exiftool 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 · act-now radar.

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