What is CVE-2023-40857?

CVE-2023-40857 is a high-severity vulnerability in Virustotal Yara, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2023-08-28.

How severe is CVE-2023-40857?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Virustotal Yara

CVE-2023-40857

Buffer Overflow vulnerability in VirusTotal yara v.4.3.2 allows a remote attacker to execute arbtirary code via the yr_execute_cod function in the exe.c component.

Vulnerability class: Buffer Overflow

Published 2023-08-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (63.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Virustotal Yara — versions 4.3.2

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/VirusTotal/yara/issues/1945 (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-40857?: CVE-2023-40857 is a high-severity vulnerability in Virustotal Yara, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2023-08-28.
How severe is CVE-2023-40857?: High severity. CVSS v3 base score is 8.8 out of 10.