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HAProxy 2.1 vulnerabilities

6 known CVEs affect the 2.1 line of HAProxy.

9.1 max CVSSSupport ended 2021-03-18

Fixed in

2.1.4
Check your versionhaproxy -v

CVEs affecting 2.1

CVE Title CVSS Exploited EPSS Published
CVE-2023-25725 HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in som... 9.1 — 2023-02-14
CVE-2026-55203 HAProxy - Integer Overflow in FCGI Demux Record Length Field 9.0 — 2026-06-19
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 atta... 8.8 — 2020-04-02
CVE-2026-55204 HAProxy - NULL Pointer Dereference in hpack_dht_insert Function 8.7 — 2026-06-19
CVE-2023-45539 HAProxy before 2.8.2 accepts # as part of the URI component, which might allow remote attackers to obtain sens... 8.2 — 2023-11-28
CVE-2023-0836 An information leak vulnerability was discovered in HAProxy 2.1, 2.2 before 2.2.27, 2.3, 2.4 before 2.4.21, 2.... 7.5 — 2023-03-29

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Data: CVE List (CVE® Program), NVD, CISA KEV, FIRST EPSS (see EPSS at https://www.first.org/epss), endoflife.date. Software list: awesome-selfhosted (CC BY-SA 3.0).