What is CVE-2021-45935?

CVE-2021-45935 is a medium-severity vulnerability in Grok Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-01-01.

How severe is CVE-2021-45935?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Grok Project

CVE-2021-45935

Grok 9.5.0 has a heap-based buffer overflow in openhtj2k::T1OpenHTJ2K::decompress (called from std::__1::__packaged_task_func<std::__1::__bind<grk::T1DecompressScheduler::deco and std::__1::packaged_task<int).

Vulnerability class: Buffer Overflow

Published 2022-01-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.8th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Grok Project — versions 9.5.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/google/oss-fuzz-vulns/blob/main/vulns/grok/OSV-2021-1344.yaml (Exploit, Third Party Advisory)
bugs.chromium.org/p/oss-fuzz/issues/detail (Exploit, Third Party Advisory, Issue Tracking)
github.com/osamu620/OpenHTJ2K (Third Party Advisory)

Frequently asked questions

What is CVE-2021-45935?: CVE-2021-45935 is a medium-severity vulnerability in Grok Project, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-01-01.
How severe is CVE-2021-45935?: Medium severity. CVSS v3 base score is 5.5 out of 10.