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Fencer Vulns
high 7.3

CVE-2023-25950 json

HTTP request/response smuggling vulnerability in HAProxy version 2.7.0, and 2.6.1 to 2.6.7 allows a remote attacker to alter a legitimate u…

published 2023-04-11 3 y ago modified 2026-09-08 2 mo ago also BIT-haproxy-2023-25950 , EUVD-2023-29838

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

HTTP request/response smuggling vulnerability in HAProxy version 2.7.0, and 2.6.1 to 2.6.7 allows a remote attacker to alter a legitimate user's request. As a result, the attacker may obtain sensitive information or cause a denial-of-service (DoS) condition.

Patch / fix

  • bitnami haproxy 2.6.8, 2.7.1
  • haproxy Debian 14, Debian 13, Debian 12 2.6.8-1

debian advisories DEBIAN-CVE-2023-25950

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-25950 updated cvss 7.3

haproxy: malformed HTTP header field name can lead to HTTP request/response smuggling

  • Red Hat Enterprise Linux 7 haproxy
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 haproxy
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 3.11 haproxy, haproxy18
    affected: no fix planned “Out of support scope”
  • Red Hat Software Collections rh-haproxy18-haproxy, rh-haproxy18-haproxy-syspaths
    affected: no fix planned “Will not fix”
  • Red Hat Ceph Storage 5 haproxy, haproxy22 Red Hat Enterprise Linux 8 haproxy Red Hat OpenShift Container Platform 4 haproxy, haproxy18, haproxy20, haproxy22, haproxy26, haproxy28
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

2.97% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
OSV 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
bitnami haproxy
>=2.6.1, <2.6.8
>=2.7.0, <2.7.1
2.6.8
2.7.1

Affected products

  • HAProxy Technologies HAProxy

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.