CVE-2021-34122 json
The function bitstr_tell at bitstr.c in ffjpeg commit 4ab404e has a NULL pointer dereference.
published 2022-03-10 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20785
- cvss
- 5.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
Summary
The function bitstr_tell at bitstr.c in ffjpeg commit 4ab404e has a NULL pointer dereference.
Patch / fix
- rockcarry ffjpeg 2021-03-16
- github.com/rockcarry/ffjpeg#37 pull request
- github.com/rockcarry/ffjpeg/issues/36 advisory
Exploit prediction
0.82% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/rockcarry/ffjpeg/issues/36 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-476 NULL Pointer Dereference
References
-
github.com
/rockcarry/ffjpeg/pull/37
patch, third-party-advisory
-
github.com
/rockcarry/ffjpeg/issues/36
exploit, patch, third-party-advisory
Sources
- CVE List CVE-2021-34122
- NVD CVE-2021-34122
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