Is CVE-2009-0939 in the CISA KEV catalog?

No. CVE-2009-0939 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-0939?

CVE-2009-0939 has a CVSS v2 base score of 10.0 (HIGH).

What is the EPSS score for CVE-2009-0939?

CVE-2009-0939 has an EPSS score of 2.05% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-0939?

Upgrade tor on debian 11 to 0.2.0.34-1 or later.

CVE & CISA-KEV Catalog

CVE-2009-0939

HIGHEPSS 79th pctl

10.0

CVSS v2

NVD

Description

Tor before 0.2.0.34 treats incomplete IPv4 addresses as valid, which has unknown impact and attack vectors related to "Spec conformance," as demonstrated using 192.168.0.

How to fix

Remediation Available

torDebian

Fixed in:0.2.0.34-1CVE-2009-0939

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.05%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Vendor Advisory1

secunia.com

Other references4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.