CVE-2011-0427

CVE-2011-0427 is a medium-severity vulnerability in Tor with a CVSS 2.0 base score of 6.8. 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-119.

Key facts

Description

Heap-based buffer overflow in Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unspecified vectors.

Frequently asked questions

What is CVE-2011-0427?
Heap-based buffer overflow in Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unspecified vectors.
How severe is CVE-2011-0427?
CVE-2011-0427 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2011-0427 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0427?
CVE-2011-0427 primarily affects Tor. In total, 207 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-0427?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-0427 published?
CVE-2011-0427 was published on 2011-01-19 and last updated on 2026-06-16.

References

Affected products (207)

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