CVE-2018-0490

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-03-05 · updated 2026-06-17
Weakness: CWE-476

Description

An issue was discovered in Tor before 0.2.9.15, 0.3.1.x before 0.3.1.10, and 0.3.2.x before 0.3.2.10. The directory-authority protocol-list subprotocol implementation allows remote attackers to cause a denial of service (NULL pointer dereference and directory-authority crash) via a misformatted relay descriptor that is mishandled during voting.

Affected products

Debian Linux: 9.0
torproject Tor: through 0.2.9.14; from 0.3.1.7 through 0.3.1.9; 0.3.1.1-alpha, 0.3.1.2-alpha, 0.3.1.3-alpha, 0.3.1.4-alpha, 0.3.1.5-alpha, 0.3.1.6-rc (+9)

References

https://blog.torproject.org/new-stable-tor-releases-security-fixes-and-dos-prevention-03210-03110-02915
https://trac.torproject.org/projects/tor/ticket/25074
https://www.debian.org/security/2018/dsa-4183
https://blog.torproject.org/new-stable-tor-releases-security-fixes-and-dos-prevention-03210-03110-02915
https://trac.torproject.org/projects/tor/ticket/25074
https://www.debian.org/security/2018/dsa-4183

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