CVE-2018-0491

Tor vulnerability

CVSS

7.5

EPSS

15.1%

EPSS pct

96th

Exploited

No known

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 vendor

Torproject

Affected product

Tor

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness type (CWE)

CWE-416 — Use After Free

Published

2018-03-05

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 15.1% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2018-0491

Confirm whether Torproject Tor is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2018-0491.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-0491

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