How severe is CVE-2012-3517?

CVE-2012-3517 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2012-3517 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-3517?

CVE-2012-3517 affects Tor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2012-3517?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2012-3517 published?

CVE-2012-3517 was published on 2012-08-26 and last updated on 2026-06-16.

CVE-2012-3517

CVE-2012-3517 is a medium-severity vulnerability in Tor with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Tor
Published: 2012-08-26
Last modified: 2026-06-16

Description

Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to cause a denial of service (daemon crash) via vectors related to failed DNS requests.

Frequently asked questions

What is CVE-2012-3517?: Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to cause a denial of service (daemon crash) via vectors related to failed DNS requests.
How severe is CVE-2012-3517?: CVE-2012-3517 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2012-3517 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-3517?: CVE-2012-3517 affects Tor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2012-3517?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-3517 published?: CVE-2012-3517 was published on 2012-08-26 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:tor:tor:*:*:*:*:*:*:*:*

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