Every CVE Search/ Get API key

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,...

8.8 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

61.6%Up 55.0 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 8.8

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.

Record
CVE-2020-11100
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Weakness
CWE-787
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2020-11100
Updated
2026-11-02
EUVDEUVD-2020-3458 No score

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.

Record
EUVD-2020-3458
Updated
2026-11-03
GitHub AdvisoriesGHSA-3xcv-57q9-hrj2 8.8

In hpack_dht_insert in hpack-tbl.c in the HPACK decoder in HAProxy 1.8 through 2.x before 2.1.4,...

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.

Record
GHSA-3xcv-57q9-hrj2
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
OSVALPINE-CVE-2020-11100 8.8

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.

Record
ALPINE-CVE-2020-11100
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSV 8.8

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.

Record
CVE-2020-11100
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 13 moreShow less
OSVDEBIAN-CVE-2020-11100 8.8

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.

Record
DEBIAN-CVE-2020-11100
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2020:1287 8.8

Red Hat Security Advisory: OpenShift Container Platform 3.11 security update

Record
RHSA-2020:1287
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2020:1288 8.8

Red Hat Security Advisory: haproxy security update

Record
RHSA-2020:1288
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2020:1289 8.8

Red Hat Security Advisory: haproxy security update

Record
RHSA-2020:1289
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2020:1290 8.8

Red Hat Security Advisory: rh-haproxy18-haproxy security update

Record
RHSA-2020:1290
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2020:1936 8.8

Red Hat Security Advisory: OpenShift Container Platform 4.4.3 haproxy security update

Record
RHSA-2020:1936
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2020-11100 8.8

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.

Record
UBUNTU-CVE-2020-11100
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVBIT-haproxy-2020-11100 No score

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.

Record
BIT-haproxy-2020-11100
Updated
2026-11-02
OSVopenSUSE-SU-2020:0444-1 No score

Security update for haproxy

This update for haproxy fixes the following issues:

  • CVE-2020-11100: Fixed an H2/HPAC vulnerability ch might have allowed arbitrary writes into a 32-bit relative address space (bsc#1168023).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Record
openSUSE-SU-2020:0444-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:10839-1 No score

haproxy-2.4.4+git0.acb1d0bea-1.2 on GA media

These are all security issues fixed in the haproxy-2.4.4+git0.acb1d0bea-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10839-1
Updated
2026-11-02
OSVSUSE-SU-2020:0851-1 No score

Security update for haproxy

This update for haproxy fixes the following issues:

  • CVE-2020-11100: Fixed an H2/HPAC vulnerability ch might have allowed arbitrary writes into a 32-bit relative address space (bsc#1168023).
Record
SUSE-SU-2020:0851-1
Updated
2026-11-02
OSVSUSE-SU-2020:0852-1 No score

Security update for haproxy

This update for haproxy fixes the following issues:

  • CVE-2020-11100: Fixed an H2/HPAC vulnerability ch might have allowed arbitrary writes into a 32-bit relative address space (bsc#1168023).
Record
SUSE-SU-2020:0852-1
Updated
2026-11-02
OSVUSN-4321-1 No score

haproxy vulnerability

Felix Wilhelm discovered that HAProxy incorrectly handled certain HTTP/2 requests. An attacker could possibly use this to execute arbitrary code.

Record
USN-4321-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
haproxy
Alpine:v3.10
 1.8.0 up to 2.0.14-r0
2.0.14-r0
haproxy
Alpine:v3.11
 1.8.0 up to 2.0.14-r0
2.0.14-r0
haproxy
Alpine:v3.12
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.13
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.14
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.15
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.16
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.17
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.18
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.19
 1.8.0 up to 2.1.4-r0
2.1.4-r0
Show 35 moreShow less
Affected packages
PackageAffectedFixed
haproxy
Alpine:v3.20
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.21
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.22
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.23
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.24
 1.8.0 up to 2.1.4-r0
2.1.4-r0
haproxy
Alpine:v3.9
 1.8.0 up to 1.8.25-r0
1.8.25-r0
haproxy
Bitnami
 1.8.0 up to 2.1.4
2.1.4
haproxy
Debian:12
 before 2.0.13-2
2.0.13-2
haproxy
Debian:13
 before 2.0.13-2
2.0.13-2
haproxy
Debian:14
 before 2.0.13-2
2.0.13-2
haproxy
Debian:10
 before 1.8.19-1+deb10u2, plus listed versions
1.8.19-11.8.19-1+deb10u11.8.19-1+deb10u2~bpo9+1
1.8.19-1+deb10u2
haproxy
Red Hat:openshift:3.11::el7
From an advisory covering 3 CVEs
 before 0:1.8.23-3.el7
0:1.8.23-3.el7
haproxy-debuginfo
Red Hat:openshift:3.11::el7
From an advisory covering 3 CVEs
 before 0:1.8.23-3.el7
0:1.8.23-3.el7
haproxy18
Red Hat:openshift:3.11::el7
From an advisory covering 3 CVEs
 before 0:1.8.23-3.el7
0:1.8.23-3.el7
haproxy
Red Hat:enterprise_linux:8::appstream
 before 0:1.8.15-6.el8_1.1
0:1.8.15-6.el8_1.1
haproxy-debuginfo
Red Hat:enterprise_linux:8::appstream
 before 0:1.8.15-6.el8_1.1
0:1.8.15-6.el8_1.1
haproxy-debugsource
Red Hat:enterprise_linux:8::appstream
 before 0:1.8.15-6.el8_1.1
0:1.8.15-6.el8_1.1
haproxy
Red Hat:rhel_e4s:8.0::appstream
 before 0:1.8.15-5.el8_0.1
0:1.8.15-5.el8_0.1
haproxy-debuginfo
Red Hat:rhel_e4s:8.0::appstream
 before 0:1.8.15-5.el8_0.1
0:1.8.15-5.el8_0.1
haproxy-debugsource
Red Hat:rhel_e4s:8.0::appstream
 before 0:1.8.15-5.el8_0.1
0:1.8.15-5.el8_0.1
rh-haproxy18-haproxy
Red Hat:rhel_software_collections:3::el7
 before 0:1.8.17-1.el7.1
0:1.8.17-1.el7.1
rh-haproxy18-haproxy-debuginfo
Red Hat:rhel_software_collections:3::el7
 before 0:1.8.17-1.el7.1
0:1.8.17-1.el7.1
rh-haproxy18-haproxy-syspaths
Red Hat:rhel_software_collections:3::el7
 before 0:1.8.17-1.el7.1
0:1.8.17-1.el7.1
haproxy
Red Hat:openshift:4.4::el7
From an advisory covering 3 CVEs
 before 0:2.0.13-3.el7
0:2.0.13-3.el7
haproxy-debuginfo
Red Hat:openshift:4.4::el7
From an advisory covering 3 CVEs
 before 0:2.0.13-3.el7
0:2.0.13-3.el7
haproxy20
Red Hat:openshift:4.4::el7
From an advisory covering 3 CVEs
 before 0:2.0.13-3.el7
0:2.0.13-3.el7
haproxy
Red Hat:openshift:4.4::el8
From an advisory covering 3 CVEs
 before 0:2.0.13-3.el8
0:2.0.13-3.el8
haproxy-debugsource
Red Hat:openshift:4.4::el8
From an advisory covering 3 CVEs
 before 0:2.0.13-3.el8
0:2.0.13-3.el8
haproxy20
Red Hat:openshift:4.4::el8
From an advisory covering 3 CVEs
 before 0:2.0.13-3.el8
0:2.0.13-3.el8
haproxy20-debuginfo
Red Hat:openshift:4.4::el8
From an advisory covering 3 CVEs
 before 0:2.0.13-3.el8
0:2.0.13-3.el8
haproxy
SUSE:Linux Enterprise High Availability Extension 15 SP1
 before 2.0.10+git0.ac198b92-8.12.1
2.0.10+git0.ac198b92-8.12.1
haproxy
SUSE:Linux Enterprise High Availability Extension 15
 before 2.0.10+git0.ac198b92-3.19.1
2.0.10+git0.ac198b92-3.19.1
haproxy
Ubuntu:18.04:LTS
 before 1.8.8-1ubuntu0.10, plus listed versions
1.7.9-1ubuntu11.7.9-1ubuntu21.8.4-11.8.7-11.8.8-1
Show 8 moreShow less
1.8.8-1ubuntu0.11.8.8-1ubuntu0.21.8.8-1ubuntu0.31.8.8-1ubuntu0.41.8.8-1ubuntu0.61.8.8-1ubuntu0.71.8.8-1ubuntu0.81.8.8-1ubuntu0.9
1.8.8-1ubuntu0.10
haproxy
openSUSE:Leap 15.1
 before 2.0.10+git0.ac198b92-lp151.2.9.1
2.0.10+git0.ac198b92-lp151.2.9.1
haproxy
openSUSE:Tumbleweed
From an advisory covering 9 CVEs
 before 2.4.4+git0.acb1d0bea-1.2
2.4.4+git0.acb1d0bea-1.2

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-11100 is a high vulnerability (CVSS 8.8) in Haproxy, published April 2, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 61.6%, the 99th percentile. Fixed in haproxy 2.0.14-r0.

References

Show 56 moreShow less
Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open