CVE-2012-3519

routerlist.c in Tor before 0.2.2.38 uses a different amount of time for relay-list iteration depending on which relay is chosen, which might allow remote attackers to obtain sensitive information about relay selection via a timing side-channel attack.

Published: 2012-08-26 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-3519 is rated Moderate Risk (43.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.64%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2012-3519

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 0.68% 0.64% -0.04%
2 2025-03-29 0.64% 0.68% +0.04%
3 2023-03-07 — 0.64% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-3519

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2012-3519

OS Trackers for CVE-2012-3519

vendor priority summary link
debian low CVE-2012-3519 low priority: Debian including 1 source packages (tor), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2012-3519
gentoo normal CVE-2012-3519: 1 GLSA(s) (201301-03), 1 atom(s) (net-misc/tor); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2012-3519
ubuntu medium CVE-2012-3519 medium priority: Ubuntu including 1 source packages (tor), 16 status rows across 16 suites (hardy, lucid, natty, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): released 11, ignored 4, DNE 1. https://ubuntu.com/security/CVE-2012-3519

Affected software / configurations for CVE-2012-3519

Vendor Product Version Raw CPE
tor tor <= 0.2.2.37 cpe:2.3:a:tor:tor:*:*:*:*:*:*:*:*

References for CVE-2012-3519

cvelogic Threat Intelligence