CVE-2020-8437 in the critical feed json
The bencoding parser in BitTorrent uTorrent through 3.5.5 (build 45505) misparses nested bencoded dictionaries, which allows a remote attac…
published 6y ago modified 4mo ago also EUVD-2020-29304
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 12.0%
- EPSS 12.0% chance of exploitation in 30 days, percentile 96%
- public exploits
- 0
- none known
Summary
The bencoding parser in BitTorrent uTorrent through 3.5.5 (build 45505) misparses nested bencoded dictionaries, which allows a remote attacker to cause a denial of service.
Is CVE-2020-8437 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
12.04% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- blog.whtaguy.com https://blog.whtaguy.com/2020/09/utorrent-cve-2020-8437-vulnerability.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-476 NULL Pointer Dereference
References
-
blog.whtaguy.com
/2020/09/utorrent-cve-2020-8437-vulnerability.html
exploit, third-party-advisory
-
forum.utorrent.com
/forum/13-announcements/
vendor-advisory
-
utclient.utorrent.com
/offers/beta_release_notes/release_notes.html
release-notes, vendor-advisory
-
twitter.com
/va_start
third-party-advisory
Sources
- CVE List CVE-2020-8437
- NVD CVE-2020-8437
Fencer Intel 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.