CVE-2021-29488 json
Creation of files outside the Download Folder through malicious PAR2 files
published 2021-05-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-16087
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 59%
- public exploits
- 0
- none known
Summary
SABnzbd is an open source binary newsreader. A vulnerability was discovered in SABnzbd that could trick the `filesystem.renamer()` function into writing downloaded files outside the configured Download Folder via malicious PAR2 files. A patch was released as part of SABnzbd 3.2.1RC1. As a workaround, limit downloads to NZBs without PAR2 files, deny write permissions to the SABnzbd process outside areas it must access to perform its job, or update to a fixed version.
Patch / fix
- sabnzbd sabnzbd 3.0.0, 3.2.1
- sabnzbdplus Debian 14, Debian 13, Debian 12 3.2.1+dfsg-1
debian advisories DEBIAN-CVE-2021-29488
Exploit prediction
0.89% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Affected products
- sabnzbd sabnzbd
Classification
- Weakness
-
- CWE-23 Relative Path Traversal
References
-
github.com
/sabnzbd/sabnzbd/security/advisories/GHSA-jwj3-wrvf-v3rp
patch, third-party-advisory
Sources
- CVE List CVE-2021-29488
- NVD CVE-2021-29488
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