MEDIUM
The http_request_split_value function in request.c in lighttpd before 1.4.32 allows remote attackers to cause a denial of service (infinite loop) via a request with a header containing an empty token, as demonstrated using the "Connection: TE,,Keep-Alive" header
Published Nov 24, 2012
5.0
MEDIUMCVSS 2.0
EPSS 12.04%
Description
The http_request_split_value function in request.c in lighttpd before 1.4.32 allows remote attackers to cause a denial of service (infinite loop) via a request with a header containing an empty token, as demonstrated using the "Connection: TE,,Keep-Alive" header.
Affected products
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.
12.04% 0.12038
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.12038
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 (31 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 12.04% (0.12038) | 96.02th | v5 (v2026.06.15) |
| Jun 15, 2026 | 12.04% (0.12038) | 95.59th | v5 (v2026.06.15) |
| Apr 11, 2026 | 37.91% (0.37913) | 97.21th | v4 (v2025.03.14) |
| Feb 6, 2026 | 39.10% (0.39102) | 97.16th | v4 (v2025.03.14) |
| Dec 28, 2025 | 42.69% (0.42692) | 97.34th | v4 (v2025.03.14) |
| Dec 27, 2025 | 37.63% (0.37625) | 97.08th | v4 (v2025.03.14) |
| Oct 28, 2025 | 42.69% (0.42692) | 97.30th | v4 (v2025.03.14) |
| Oct 27, 2025 | 37.63% (0.37625) | 97.02th | v4 (v2025.03.14) |
| Oct 23, 2025 | 42.69% (0.42692) | 97.30th | v4 (v2025.03.14) |
| Oct 22, 2025 | 44.19% (0.44193) | 97.37th | v4 (v2025.03.14) |
| Oct 3, 2025 | 42.69% (0.42692) | 97.40th | v4 (v2025.03.14) |
| Oct 2, 2025 | 44.19% (0.44193) | 97.47th | v4 (v2025.03.14) |
| Oct 1, 2025 | 42.69% (0.42692) | 97.39th | v4 (v2025.03.14) |
| Jul 30, 2025 | 37.63% (0.37625) | 97.05th | v4 (v2025.03.14) |
| Jun 29, 2025 | 42.69% (0.42692) | 97.31th | v4 (v2025.03.14) |
| Mar 30, 2025 | 39.34% (0.39343) | 97.00th | v4 (v2025.03.14) |
| Mar 29, 2025 | 36.33% (0.36333) | 95.56th | v4 (v2025.03.14) |
| Mar 17, 2025 | 39.34% (0.39343) | 96.96th | v4 (v2025.03.14) |
| Dec 17, 2024 | 20.27% (0.20271) | 96.35th | v3 (v2023.03.01) |
| Jun 24, 2024 | 66.34% (0.66343) | 97.95th | v3 (v2023.03.01) |
| Apr 21, 2024 | 71.09% (0.71091) | 98.01th | v3 (v2023.03.01) |
| Feb 18, 2024 | 74.52% (0.74523) | 98.04th | v3 (v2023.03.01) |
| Dec 19, 2023 | 84.32% (0.84320) | 98.19th | v3 (v2023.03.01) |
| Mar 7, 2023 | 86.96% (0.86957) | 97.98th | v3 (v2023.03.01) |
| Mar 6, 2023 | 12.57% (0.12567) | 95.52th | v2 (v2022.01.01) |
| Feb 8, 2023 | 12.57% (0.12567) | 95.36th | v2 (v2022.01.01) |
| Nov 7, 2022 | 12.96% (0.12955) | 95.51th | v2 (v2022.01.01) |
| Aug 5, 2022 | 13.61% (0.13605) | 95.51th | v2 (v2022.01.01) |
| Apr 28, 2022 | 14.49% (0.14493) | 95.51th | v2 (v2022.01.01) |
| Apr 1, 2022 | 15.65% (0.15648) | 95.72th | v2 (v2022.01.01) |
| Feb 4, 2022 | 15.65% (0.15648) | 92.63th | v2 (v2022.01.01) |
Weaknesses (1)
References (16)
- http://download.lighttpd.net/lighttpd/security/lighttpd-1.4.31_fix_connection_header_dos.patch x_refsource_MISCPatch
- http://download.lighttpd.net/lighttpd/security/lighttpd_sa_2012_01.txt x_refsource_CONFIRMVendor Advisory
- http://lists.opensuse.org/opensuse-updates/2012-11/msg00044.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-updates/2014-01/msg00051.html vendor-advisoryx_refsource_SUSE
- http://marc.info/?l=bugtraq&m=141576815022399&w=2 vendor-advisoryx_refsource_HP
- http://osvdb.org/87623 vdb-entryx_refsource_OSVDB
- http://packetstormsecurity.org/files/118282/Simple-Lighttpd-1.4.31-Denial-Of-Service.html x_refsource_MISC
- http://secunia.com/advisories/51268 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/51298 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://www.exploit-db.com/exploits/22902 exploitx_refsource_EXPLOIT-DB
- http://www.mandriva.com/security/advisories?name=MDVSA-2013:100 vendor-advisoryx_refsource_MANDRIVA
- http://www.openwall.com/lists/oss-security/2012/11/21/1 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/56619 vdb-entryx_refsource_BIDExploit
- http://www.securitytracker.com/id?1027802 vdb-entryx_refsource_SECTRACK
- https://exchange.xforce.ibmcloud.com/vulnerabilities/80213 vdb-entryx_refsource_XF
- https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0345 x_refsource_CONFIRM
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Nov 24, 2012
Updated Aug 6, 2024
Reserved Oct 24, 2012
Link CVE-2012-5533
CISA Vulnrichment
Updated n/a