CVE-2011-0015

NONECVSS 0.0

0.0

Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha does not properly check the amount of compression in zlib-compressed data, which allows remote attackers to cause a denial of service via a large compression factor.

CVSS v3: —
EG Score: 0.0(none)
EPSS: 85.2%
KEV: Not listed

Published

January 19, 2011

Last Modified

April 29, 2026

References (24)

secalert@redhathttp://archives.seul.org/or/announce/Jan-2011/msg00000.html
secalert@redhathttp://blog.torproject.org/blog/tor-02129-released-security-patches
secalert@redhathttp://secunia.com/advisories/42905
secalert@redhathttp://secunia.com/advisories/42907
secalert@redhathttp://www.debian.org/security/2011/dsa-2148
secalert@redhathttp://www.openwall.com/lists/oss-security/2011/01/18/7
secalert@redhathttp://www.securityfocus.com/bid/45832
secalert@redhathttp://www.securitytracker.com/id?1024980
secalert@redhathttp://www.vupen.com/english/advisories/2011/0131
secalert@redhathttp://www.vupen.com/english/advisories/2011/0132
secalert@redhathttps://gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog
secalert@redhathttps://trac.torproject.org/projects/tor/ticket/2324
af854a3a-2127-422b-91ae-364da2661108http://archives.seul.org/or/announce/Jan-2011/msg00000.html
af854a3a-2127-422b-91ae-364da2661108http://blog.torproject.org/blog/tor-02129-released-security-patches
af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/42905

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-20Improper Input Validation

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 06:08 UTCepss_batch
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2026-06-04 13:09 UTCepss_batch
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2026-05-31 22:28 UTCepss_batch
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2026-05-29 13:41 UTCepss_batch
2026-05-29 13:40 UTCepss_batch
2026-05-29 09:10 UTCEG score recompute
2026-05-29 09:10 UTCGHSA enrichment
2026-05-28 13:42 UTCepss_batch
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2026-05-28 13:42 UTCepss_batch
2026-05-27 13:38 UTCepss_batch

Frequently asked(4)

What is CVE-2011-0015?

CVE-2011-0015 is a none vulnerability published on January 19, 2011. Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha does not properly check the amount of compression in zlib-compressed data, which allows remote attackers to cause a denial of service via a large compression factor.

When was CVE-2011-0015 disclosed?

CVE-2011-0015 was first published in the National Vulnerability Database on January 19, 2011, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2011-0015 actively exploited?

CVE-2011-0015 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 85.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2011-0015?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-0015, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2011-0015

📅 Published

🔄 Last Modified

🔗 References (24)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2011-0015?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (24)

Frequently asked(4)

Related CVEs(same CWE)