CVE-2018-0491: torproject tor Use After Free
CVSS: 7.5v3.0HighModified
AliasesUBUNTU-CVE-2018-0491DEBIAN-CVE-2018-0491
Published 05-03-2018Last modified 05-08-2024
Vulnerability summary
CVE-2018-0491 is a high (CVSS 7.5) Use After Free vulnerability in torproject tor. EPSS estimates a 14.79% chance of exploitation in the next 30 days, higher than 96.6% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.0 (NVD)EPSS score
14.79%
0%100%
Medium · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1exploit-database
Advisory lineage
Upstream 0 · Downstream 4 · Related 3Timeline
- 05-03-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
14.79%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
0.00 pp
From 14.79% on 18-09-2026
18-09-202618-10-2026
EPSS score14.79%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundTor Browser < 0.3.2.10 - Use After Free (PoC)
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Debian1 product
- tor< 0.3.2.10-1
Torproject1 product
- tor≥ 0.3.2.0, < 0.3.2.10
Ubuntu1 product
- tor< 0.3.2.10-1
3 vendors · 3 products
References
7 links- trac.torproject.org/projects/tor/ticket/24700X Refsource CONFIRMIssue TrackingMitigationVendor AdvisoryREPORT
- trac.torproject.org/projects/tor/ticket/25117X Refsource CONFIRMIssue TrackingPatchVendor AdvisoryREPORT
- blog.torproject.org/new-stable-tor-releases-security-fixes-and-dos-prevention-03210-03110-02915X Refsource CONFIRMVendor AdvisoryREPORT
