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 request, possibly causing remote code execution.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 61.6%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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 request, possibly causing remote code execution.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 61.59% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- haproxy/haproxy · debian/debian linux · redhat/openshift container platform · fedoraproject/fedora · canonical/ubuntu linux · opensuse/leap
- Source
- cve@mitre.org
EPSS 61.6% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00002.htmlMailing List, Third Party Advisory
- http://packetstormsecurity.com/files/157323/haproxy-hpack-tbl.c-Out-Of-Bounds-Write.htmlThird Party Advisory, VDB Entry
- http://www.haproxy.orgVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1819111Issue Tracking, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1168023Issue Tracking, Third Party Advisory
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=5dfc5d5cd0d2128d77253ead3acf03a421ab5b88
- https://lists.debian.org/debian-security-announce/2020/msg00052.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/264C7UL3X7L7QE74ZJ557IOUFS3J4QQC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MNW5RZLIX7LOXRLV7WMHX22CI43XSXKW/
- https://security.gentoo.org/glsa/202012-22Third Party Advisory
- https://usn.ubuntu.com/4321-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4649Third Party Advisory
- https://www.haproxy.org/download/2.1/src/CHANGELOGRelease Notes, Vendor Advisory
- https://www.mail-archive.com/haproxy%40formilux.org/msg36876.html
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00002.htmlMailing List, Third Party Advisory
- http://packetstormsecurity.com/files/157323/haproxy-hpack-tbl.c-Out-Of-Bounds-Write.htmlThird Party Advisory, VDB Entry
- http://www.haproxy.orgVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1819111Issue Tracking, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1168023Issue Tracking, Third Party Advisory
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=5dfc5d5cd0d2128d77253ead3acf03a421ab5b88
- https://lists.debian.org/debian-security-announce/2020/msg00052.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/264C7UL3X7L7QE74ZJ557IOUFS3J4QQC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MNW5RZLIX7LOXRLV7WMHX22CI43XSXKW/
- https://security.gentoo.org/glsa/202012-22Third Party Advisory
- https://usn.ubuntu.com/4321-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4649Third Party Advisory
- https://www.haproxy.org/download/2.1/src/CHANGELOGRelease Notes, Vendor Advisory
- https://www.mail-archive.com/haproxy%40formilux.org/msg36876.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.