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Fencer Vulns
high 7.5

CVE-2018-0491 in the critical feed json

A use-after-free issue was discovered in Tor 0.3.2.x before 0.3.2.10.

published 2018-03-05 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-1314

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
14.8%
EPSS 14.8% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • torproject tor 0.3.2.10
  • tor Debian 14, Debian 13, Debian 12 0.3.2.10-1

debian advisories DEBIAN-CVE-2018-0491

  • tor Ubuntu 18.04 LTS 0.3.2.10-1

ubuntu advisories UBUNTU-CVE-2018-0491

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tor openSUSE Tumbleweed 0.4.6.7-2.2
  • tor Package Hub 12 0.3.2.10-14.1

opensuse advisories openSUSE-SU-2024:11469-1openSUSE-SU-2018:0614-1openSUSE-SU-2018:0620-1

  • tor Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 0.3.2.10-r0

alpine advisories ALPINE-CVE-2018-0491

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-0491 updated cvss 4.3

tor: use-after-free in KIST implementation

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-44994)

Exploit prediction

14.79% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-44994 Tor Browser < 0.3.2.10 - Use After Free (PoC) dos, 2018-07-09

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/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

Affected products

  • n/a Tor

Classification

Weakness

References

Sources

Fencer Vulns 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.