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CVE-2020-11100In 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…
- 8.8HighCVSS base score
- 61.6%Exploitation in 30 daysEPSS · top 0.8% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By mitre
- 3 days later
· 3 days later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 61.6% · top 0.8% of all CVEs (12 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
n/a
- affected n/a
References
References14
- http://www.haproxy.org (opens in a new tab)x_refsource_MISCx_transferred
- https://www.haproxy.org/download/2.1/src/CHANGELOG (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://lists.debian.org/debian-security-announce/2020/msg00052.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.mail-archive.com/haproxy%40formilux.org/msg36876.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=1819111 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=5dfc5d5cd0d2128d77253ead3acf03a421ab5b88 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugzilla.suse.com/show_bug.cgi?id=1168023 (opens in a new tab)x_refsource_CONFIRMx_transferred
- openSUSE-SU-2020:0444 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- FEDORA-2020-16cd111544 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- DSA-4649 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- USN-4321-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- http://packetstormsecurity.com/files/157323/haproxy-hpack-tbl.c-Out-Of-Bounds-Write.html (opens in a new tab)x_refsource_MISCx_transferred
- FEDORA-2020-13fd8b1721 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- GLSA-202012-22 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2020-3458 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2020-11100)Record last updated .