CVE-2018-0491

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 14.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-03-05 · updated 2026-06-17
Weakness: CWE-416

Description

A use-after-free issue was discovered in Tor 0.3.2.x before 0.3.2.10. It allows remote attackers to cause a denial of service (relay crash) because the KIST implementation allows a channel to be added more than once in the pending list.

Affected products

torproject Tor: from 0.3.2.0 before 0.3.2.10 — fixed in 0.3.2.10

How to fix

Upgrade to a fixed version: torproject Tor 0.3.2.10. Check the vendor advisory for mitigations.

References

https://blog.torproject.org/new-stable-tor-releases-security-fixes-and-dos-prevention-03210-03110-02915
https://trac.torproject.org/projects/tor/ticket/24700
https://trac.torproject.org/projects/tor/ticket/25117
https://www.exploit-db.com/exploits/44994/
https://blog.torproject.org/new-stable-tor-releases-security-fixes-and-dos-prevention-03210-03110-02915
https://trac.torproject.org/projects/tor/ticket/24700
https://trac.torproject.org/projects/tor/ticket/25117
https://www.exploit-db.com/exploits/44994/

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