CVE-2020-11100
In hpack_dht_insert in hpack-tbl.c in the HPACK decoder in HAProxy 1.8 through 2.x before 2.1.4, a remote attacker can write arbitrary bytes around a certain location on the heap via a crafted HTTP/2
02 Description
In hpack_dht_insert in hpack-tbl.c in the HPACK decoder in HAProxy 1.8 through 2.x before 2.1.4, a remote attacker can write arbitrary bytes around a certain location on the heap via a crafted HTTP/2
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 61.59% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 99.1% of scored records. A rank, not a probability.
- NVD base score
- 8.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Critical. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-04-02 14:23Z6 YR AGO
- Last updated
- 2024-08-04 11:21Z2 YR AGO
- Reserved
- 2020-03-30
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-787Out-of-bounds WriteBase
- Data version
- 5.1
- Document digest
- ab3bc2e1dd4181dcd9cd576f64089639336a2665fabbb2e67a3c753f5c6db237
05 Affected products
06 References
- www.haproxy.orghttp://www.haproxy.org
- www.haproxy.orghttps://www.haproxy.org/download/2.1/src/CHANGELOG
- lists.debian.orghttps://lists.debian.org/debian-security-announce/2020/msg00052.html
- www.mail-archive.comhttps://www.mail-archive.com/haproxy%40formilux.org/msg36876.html
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1819111
- git.haproxy.orghttps://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=5dfc5d5cd0d2128d77253ead3acf03a421ab5b88
- bugzilla.suse.comhttps://bugzilla.suse.com/show_bug.cgi?id=1168023
- lists.opensuse.orgopenSUSE-SU-2020:0444http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00002.html
- lists.fedoraproject.orgFEDORA-2020-16cd111544https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MNW5RZLIX7LOXRLV7WMHX22CI43XSXKW/
- www.debian.orgDSA-4649https://www.debian.org/security/2020/dsa-4649
- usn.ubuntu.comUSN-4321-1https://usn.ubuntu.com/4321-1/
- packetstormsecurity.comhttp://packetstormsecurity.com/files/157323/haproxy-hpack-tbl.c-Out-Of-Bounds-Write.html
- lists.fedoraproject.orgFEDORA-2020-13fd8b1721https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/264C7UL3X7L7QE74ZJ557IOUFS3J4QQC/
- security.gentoo.orgGLSA-202012-22https://security.gentoo.org/glsa/202012-22
07 Fixed in
Arch Linux
- haproxy Fixed in 2.1.4-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
Debian 12
- haproxy Fixed in 2.0.13-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- haproxy Fixed in 2.0.13-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- haproxy Fixed in 2.0.13-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- haproxy Fixed in 1.8.8-1ubuntu0.10
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.