CVE-2021-45935 json
Grok 9.5.0 has a heap-based buffer overflow in openhtj2k::T1OpenHTJ2K::decompress (called from std::__1::__packaged_task_func<std::__1::__b…
published 2021-12-31 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-32644
- cvss
- 5.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 60%
- public exploits
- 0
- none known
Summary
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).
Patch / fix
- libgrokj2k Debian 12 9.7.5-1
debian advisories DEBIAN-CVE-2021-45935
Exploit prediction
0.91% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/google/oss-fuzz-vulns/blob/main/vulns/grok/OSV-2021-1344.yaml referenced PoC, tagged "exploit" by a source, unverified
- bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39021 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- 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?id=39021
exploit, issue-tracking, third-party-advisory
-
github.com
/osamu620/OpenHTJ2K
third-party-advisory
Sources
- CVE List CVE-2021-45935
- NVD CVE-2021-45935
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.