CVE-2020-11100: canonical ubuntu_linux Out-of-bounds Write
Vulnerability summary
CVE-2020-11100 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in canonical ubuntu_linux. EPSS estimates a 61.59% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities.
Not severe (CVSS 8.8, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 3 · Related 1Timeline
- 02-04-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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 metrics
6 scores · 5 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · Red hatEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
61.59%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
No change 0.00 pp
From 61.59% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat7 products
- openshift_container_platform3.11 | 4.0
- haproxy< 0:1.8.15-6.el8_1.1 | < 0:1.8.15-5.el8_0.1
- haproxy-debuginfo< 0:1.8.15-6.el8_1.1 | < 0:1.8.15-5.el8_0.1
- haproxy-debugsource< 0:1.8.15-6.el8_1.1 | < 0:1.8.15-5.el8_0.1
- rh-haproxy18-haproxy< 0:1.8.17-1.el7.1
Debian2 products
- haproxy< 1.8.19-1+deb10u2 | < 2.0.13-2
- debian_linuxEOL10.0
Opensuse2 products
- leapEOL15.1
- haproxy&distro=openSUSE Leap 15.1< 2.0.10+git0.ac198b92-lp151.2.9.1
Suse2 products
- haproxy&distro=SUSE Linux Enterprise High Availability Extension 15< 2.0.10+git0.ac198b92-3.19.1
- haproxy&distro=SUSE Linux Enterprise High Availability Extension 15 SP1< 2.0.10+git0.ac198b92-8.12.1
Alpine1 product
- haproxy≥ 1.8.0, < 2.0.14-r0 | ≥ 1.8.0, < 2.1.4-r0 | ≥ 1.8.0, < 1.8.25-r0
Canonical1 product
- ubuntu_linuxEOL18.04 | 19.10
Fedoraproject1 product
- fedoraEOL30 | 31
Haproxy1 product
- haproxy≥ 1.8.0, < 2.1.4
Ubuntu1 product
- haproxy< 1.8.8-1ubuntu0.10
9 vendors · 18 products
References
38 links
lists.debian.org/debian-security-announce/2020/msg00052.htmlX Refsource CONFIRMMailing ListThird Party Advisory- www.mail-archive.com/haproxy%40formilux.org/msg36876.htmlX Refsource CONFIRM
- bugzilla.redhat.com/show_bug.cgi?id=1819111X Refsource CONFIRMREPORTIssue TrackingThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-04/msg00002.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
Show all 38 references
- packetstormsecurity.com/files/157323/haproxy-hpack-tbl.c-Out-Of-Bounds-Write.htmlX Refsource MISCThird Party AdvisoryVDB Entry
- lists.opensuse.org/archives/…Advisory