vulnerability
Arch Linux: Denial of service (CVE-2021-34548)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:N/AC:L/Au:N/C:N/I:N/A:P) | Jun 29, 2021 | Jul 11, 2025 | Nov 27, 2025 |
Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
Jun 29, 2021
Added
Jul 11, 2025
Modified
Nov 27, 2025
Description
A security issue has been found in Tor before version 0.4.5.9. Relays could spoof RELAY_END or RELAY_RESOLVED cell on half-closed streams because clients failed to validate which hop sent these cells. This would allow a relay on a circuit to end a stream that wasn't actually built with it.
Solution
arch-linux-upgrade-latest
References
- CVE-2021-34548
- https://attackerkb.com/topics/CVE-2021-34548
- URL-http://packetstormsecurity.com/files/163510/Tor-Half-Closed-Connection-Stream-Confusion.html
- URL-https://blog.torproject.org/node/2041
- URL-https://gitlab.torproject.org/tpo/core/tor/-/issues/40389
- URL-https://security.archlinux.org/ASA-202106-50
- URL-https://security.gentoo.org/glsa/202107-25
- CWE-290
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