MEDIUM
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
Published Jan 19, 2011
5.0
MEDIUMCVSS 2.0
EPSS 3.10%
Description
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.
Affected products
No data.
OR
- ≤ 0.2.1.28
- 0.0.2
- 0.0.2_pre13
- 0.0.2_pre14
- 0.0.2_pre15
- 0.0.2_pre16
- 0.0.2_pre17
- 0.0.2_pre18
- 0.0.2_pre19
- 0.0.2_pre20
- 0.0.2_pre21
- 0.0.2_pre22
- 0.0.2_pre23
- 0.0.2_pre24
- 0.0.2_pre25
- 0.0.2_pre26
- 0.0.2_pre27
- 0.0.3
- 0.0.4
- 0.0.5
- 0.0.6
- 0.0.6.1
- 0.0.6.2
- 0.0.7
- 0.0.7.1
- 0.0.7.2
- 0.0.7.3
- 0.0.8
- 0.0.8.1
- 0.0.9
- 0.0.9.1
- 0.0.9.2
- 0.0.9.3
- 0.0.9.4
- 0.0.9.5
- 0.0.9.6
- 0.0.9.7
- 0.0.9.8
- 0.0.9.9
- 0.0.9.10
- 0.1.0.1
- 0.1.0.2
- 0.1.0.3
- 0.1.0.4
- 0.1.0.5
- 0.1.0.6
- 0.1.0.7
- 0.1.0.8
- 0.1.0.9
- 0.1.0.10
- 0.1.0.11
- 0.1.0.12
- 0.1.0.13
- 0.1.0.14
- 0.1.0.15
- 0.1.0.16
- 0.1.0.17
- 0.1.1
- 0.1.1.1
- 0.1.1.1
- 0.1.1.2
- 0.1.1.2
- 0.1.1.3
- 0.1.1.3
- 0.1.1.4
- 0.1.1.4
- 0.1.1.5
- 0.1.1.5
- 0.1.1.6
- 0.1.1.6
- 0.1.1.7
- 0.1.1.7
- 0.1.1.8
- 0.1.1.8
- 0.1.1.9
- 0.1.1.9
- 0.1.1.10
- 0.1.1.10
- 0.1.1.11
- 0.1.1.12
- 0.1.1.13
- 0.1.1.14
- 0.1.1.15
- 0.1.1.16
- 0.1.1.17
- 0.1.1.18
- 0.1.1.19
- 0.1.1.20
- 0.1.1.21
- 0.1.1.22
- 0.1.1.23
- 0.1.1.25
- 0.1.1.26
- 0.1.2.1
- 0.1.2.2
- 0.1.2.3
- 0.1.2.4
- 0.1.2.5
- 0.1.2.5
- 0.1.2.6
- 0.1.2.7
- 0.1.2.8
- 0.1.2.9
- 0.1.2.10
- 0.1.2.11
- 0.1.2.12
- 0.1.2.13
- 0.1.2.14
- 0.1.2.15
- 0.1.2.16
- 0.1.2.17
- 0.1.2.18
- 0.1.2.19
- 0.1.2.30
- 0.1.2.31
- 0.2.0.1
- 0.2.0.2
- 0.2.0.3
- 0.2.0.4
- 0.2.0.5
- 0.2.0.6
- 0.2.0.7
- 0.2.0.8
- 0.2.0.9
- 0.2.0.10
- 0.2.0.11
- 0.2.0.12
- 0.2.0.13
- 0.2.0.14
- 0.2.0.15
- 0.2.0.16
- 0.2.0.17
- 0.2.0.18
- 0.2.0.19
- 0.2.0.20
- 0.2.0.21
- 0.2.0.22
- 0.2.0.23
- 0.2.0.24
- 0.2.0.25
- 0.2.0.26
- 0.2.0.27
- 0.2.0.28
- 0.2.0.29
- 0.2.0.29
- 0.2.0.30
- 0.2.0.30
- 0.2.0.31
- 0.2.0.31
- 0.2.0.32
- 0.2.0.33
- 0.2.0.34
- 0.2.0.35
- 0.2.1.1
- 0.2.1.2
- 0.2.1.3
- 0.2.1.4
- 0.2.1.5
- 0.2.1.6
- 0.2.1.7
- 0.2.1.8
- 0.2.1.9
- 0.2.1.10
- 0.2.1.11
- 0.2.1.12
- 0.2.1.12
- 0.2.1.13
- 0.2.1.14
- 0.2.1.15
- 0.2.1.16
- 0.2.1.17
- 0.2.1.18
- 0.2.1.19
- 0.2.1.20
- 0.2.1.21
- 0.2.1.22
- 0.2.1.23
- 0.2.1.24
- 0.2.1.25
- 0.2.1.26
- 0.2.1.27
- 0.2.2.1
- 0.2.2.1
- 0.2.2.2
- 0.2.2.2
- 0.2.2.3
- 0.2.2.3
- 0.2.2.4
- 0.2.2.4
- 0.2.2.5
- 0.2.2.5
- 0.2.2.6
- 0.2.2.6
- 0.2.2.7
- 0.2.2.8
- 0.2.2.9
- 0.2.2.10
- 0.2.2.11
- 0.2.2.12
- 0.2.2.13
- 0.2.2.14
- 0.2.2.15
- 0.2.2.16
- 0.2.2.17
- 0.2.2.18
- 0.2.2.19
- 0.2.2.20
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
3.10% 0.03105
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.03105
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.10% (0.03105) | 87.31th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.10% (0.03105) | 86.03th | v5 (v2026.06.15) |
| Mar 17, 2025 | 2.35% (0.02346) | 83.78th | v4 (v2025.03.14) |
| Dec 17, 2024 | 7.02% (0.07022) | 93.90th | v3 (v2023.03.01) |
| Mar 21, 2024 | 30.59% (0.30588) | 96.84th | v3 (v2023.03.01) |
| Dec 18, 2023 | 29.84% (0.29835) | 96.47th | v3 (v2023.03.01) |
| Jul 20, 2023 | 24.63% (0.24629) | 96.01th | v3 (v2023.03.01) |
| Mar 7, 2023 | 19.00% (0.18995) | 95.41th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
Weaknesses (1)
References (12)
- http://archives.seul.org/or/announce/Jan-2011/msg00000.html mailing-listx_refsource_MLISTPatch
- http://blog.torproject.org/blog/tor-02129-released-security-patches x_refsource_CONFIRMPatch
- http://secunia.com/advisories/42905 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/42907 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://www.debian.org/security/2011/dsa-2148 vendor-advisoryx_refsource_DEBIAN
- http://www.openwall.com/lists/oss-security/2011/01/18/7 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/45832 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id?1024980 vdb-entryx_refsource_SECTRACK
- http://www.vupen.com/english/advisories/2011/0131 vdb-entryx_refsource_VUPENVendor Advisory
- http://www.vupen.com/english/advisories/2011/0132 vdb-entryx_refsource_VUPENVendor Advisory
- https://gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog x_refsource_CONFIRMPatch
- https://trac.torproject.org/projects/tor/ticket/2324 x_refsource_CONFIRM
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Jan 19, 2011
Updated Aug 6, 2024
Reserved Dec 7, 2010
Link CVE-2011-0015
CISA Vulnrichment
Updated n/a