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Exploited vulnerability · CISA KEV

Is CVE-2023-4863 exploited? Yes: in CISA KEV since 13 Sep 2023

Gociux · Google Chromium WebP · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-4863, Google Chromium WebP Heap-Based Buffer Overflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 13 Sep 2023, 1 days after it was published. It affects Google Chromium WebP. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 13 Sep 2023
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity8.8CVSS 3.1 · high
US federal due4 Oct 2023BOD 22-01 deadline

What it is

Google Chromium WebP contains a heap-based buffer overflow vulnerability that allows a remote attacker to perform an out-of-bounds memory write via a crafted HTML page. This vulnerability can affect applications that use the WebP Codec.

VendorGoogle (77 exploited CVEs in KEV)
ProductChromium WebP
VulnerabilityGoogle Chromium WebP Heap-Based Buffer Overflow Vulnerability
WeaknessCWE-787
Published12 Sep 2023
Added to KEV13 Sep 2023
Reported by (CNA)Chrome

What to do

  1. Check whether you run it. Look for Chromium WebP in your asset inventory, including appliances and cloud images. Stack check lists every exploited Google CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  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 12 Sep 2023.
  4. Get told next time. Email alerts when CISA adds a CVE for Google.

References

Questions

Is CVE-2023-4863 being exploited?

Yes. CISA added CVE-2023-4863 to the Known Exploited Vulnerabilities catalog on 13 Sep 2023, which means there is reliable evidence of exploitation in the wild.

Is CVE-2023-4863 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-2023-4863?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Google's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Chromium WebP 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 September 2023 · Google scorecard · act-now radar.

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