CVE-2020-11100

8.8 highEPSS 62%

High (8.8). EPSS 62% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 62% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2020-04-02
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

canonical:ubuntu_linux
debian:debian_linux
fedoraproject:fedora
haproxy:haproxy
opensuse:leap
redhat:openshift_container_platform

References

http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00002.html
http://packetstormsecurity.com/files/157323/haproxy-hpack-tbl.c-Out-Of-Bounds-Write.html
http://www.haproxy.org
https://bugzilla.redhat.com/show_bug.cgi?id=1819111
https://bugzilla.suse.com/show_bug.cgi?id=1168023

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