CVE-2012-3519: routerlist.c in Tor before 0.2.2.38 uses a different amount of time for relay-list iteration depending on whic

Q: How do I fix CVE-2012-3519?

tor: upgrade to newer than 0.2.2.37. Exact commands for each OS are on this page.

Q: Is CVE-2012-3519 being exploited?

CVE-2012-3519 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2012-3519 affect?

CVE-2012-3519 affects tor. Severity is medium (CVSS 5.0). 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-chan

Q: How urgent is CVE-2012-3519?

Priority 39/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2012-3519 is a medium-severity flaw (CVSS 5.0) affecting tor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-200
Published	2012-08-26
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: tor

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2012-08-26 03:17 UTCPublished CVE record published
2026-06-16 23:43 UTCUpdated Record last modified

tor tor UPGRADE

Affected: <= 0.2.2.37

Fixed in: newer than 0.2.2.37

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tor || rpm -q tor || tor --version

2. UPGRADE to newer than 0.2.2.37 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tor

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tor

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2012-3519?

tor: upgrade to newer than 0.2.2.37. Exact commands for each OS are on this page.

Is CVE-2012-3519 being exploited?

CVE-2012-3519 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2012-3519 affect?

CVE-2012-3519 affects tor. Severity is medium (CVSS 5.0). 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-chan

How urgent is CVE-2012-3519?

Priority 39/100. No elevated risk signals yet.

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References

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