8.2

CVE-2023-45539: haproxy Improper Encoding or Escaping of Output

Modified
AliasesSUSE-SU-2023:4645-1SUSE-SU-2023:4647-1SUSE-SU-2024:2377-1
Published 28-11-2023Last modified 15-10-2024

Vulnerability summary

CVE-2023-45539 is a high (CVSS 8.2) Improper Encoding or Escaping of Output vulnerability in haproxy. EPSS estimates a 1.51% chance of exploitation in the next 30 days, higher than 74.5% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.2 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.2/10
010
High · v3.1 (CVE.org)
EPSS score
1.51%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 5
DSA-5590-1RHSA-2024:1089RHSA-2024:1142RHSA-2024:4853RHSA-2024:6412SUSE-SU-2023:4646-1

Timeline

  1. 28-11-2023
    PublishedVulnerability first disclosed.
  2. 15-10-2024
    Last modifiedVulnerability information updated.

Description

HAProxy before 2.8.2 accepts # as part of the URI component, which might allow remote attackers to obtain sensitive information or have unspecified other impact upon misinterpretation of a path_end rule, such as routing index.html#.png to a static server.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

1.51%

Chance of exploitation in the next 30 days

Percentile

75%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.51% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse7 products
  • haproxy&distro=SUSE Linux Enterprise High Availability Extension 15 SP2< 2.0.31-150200.11.26.1
  • haproxy&distro=SUSE Linux Enterprise High Availability Extension 15 SP3< 2.0.31-150200.11.26.1
  • haproxy&distro=SUSE Linux Enterprise High Availability Extension 15 SP4< 2.4.22+git0.f8e3218e2-150400.3.19.1
  • haproxy&distro=SUSE Linux Enterprise High Availability Extension 15 SP5< 2.4.22+git0.f8e3218e2-150400.3.19.1
  • haproxy&distro=SUSE Linux Enterprise Micro 5.3< 2.4.22+git0.f8e3218e2-150400.3.19.1
Opensuse4 products
  • haproxy&distro=openSUSE Leap 15.4< 2.4.22+git0.f8e3218e2-150400.3.19.1
  • haproxy&distro=openSUSE Leap 15.5< 2.4.22+git0.f8e3218e2-150400.3.19.1
  • haproxy&distro=openSUSE Leap Micro 5.3< 2.4.22+git0.f8e3218e2-150400.3.19.1
  • haproxy&distro=openSUSE Leap Micro 5.4< 2.4.22+git0.f8e3218e2-150400.3.19.1
Redhat3 products
  • haproxy< 0:1.8.23-3.el8_2.1 | < 0:1.8.27-5.el8_10.1 | < 0:1.8.27-4.el8_6.1 | < 0:1.8.27-5.el8_8.1 | < 0:1.8.27-2.el8_4.1
  • haproxy-debuginfo< 0:1.8.23-3.el8_2.1 | < 0:1.8.27-5.el8_10.1 | < 0:1.8.27-4.el8_6.1 | < 0:1.8.27-5.el8_8.1 | < 0:1.8.27-2.el8_4.1
  • haproxy-debugsource< 0:1.8.23-3.el8_2.1 | < 0:1.8.27-5.el8_10.1 | < 0:1.8.27-4.el8_6.1 | < 0:1.8.27-5.el8_8.1 | < 0:1.8.27-2.el8_4.1
Chainguard2 products
  • haproxy-2.4All versions (No fix recorded)
  • haproxy-2.6All versions (No fix recorded)
Debian1 product
  • haproxy< 1.8.19-1+deb10u5 | < 2.6.12-1+deb12u1 | < 2.6.15-1
Haproxy1 product
Ubuntu1 product
  • haproxy< 2.0.31-0ubuntu0.3 | < 2.4.22-0ubuntu0.22.04.3 | < 1.6.3-1ubuntu0.3+esm1 | < 1.8.8-1ubuntu0.13+esm2

7 vendors · 19 products

References

29 links
Show all 29 references