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01 Record

CVE-2023-27522

Apache HTTP Server: mod_proxy_uwsgi HTTP response splitting

HighPUBLISHEDCNA: apache
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
View raw JSON

02 Description

Apache HTTP Server: mod_proxy_uwsgi HTTP response splitting

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
2.13% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 81.9% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-03-07 15:09Z3 YR AGO
Last updated
2025-02-13 16:45Z1 YR AGO
Reserved
2023-03-02
Assigning CNA
apache
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weaknesses
  • CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')Base
  • CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')Variant
Data version
5.1
Document digest
7547e0199a2f9456ab10a963f90a8c2753cbe410fb2f741b3f8d78f234279088

05 Affected products

VendorProductVersionsPlatforms
Apache Software FoundationApache HTTP Server2.4.30 to 2.4.55—
apachehttp_server2.4.30 to 2.4.55—

06 References

07 Fixed in

AlmaLinux 8

  • httpd
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • httpd-devel
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • httpd-filesystem
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • httpd-manual
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • httpd-tools
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • mod_http2
    Fixed in 1.15.7-8.module_el8.8.0+3554+ec1058a7.3
  • mod_ldap
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • mod_md
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
    • Affected before 1:2.0.8-8.module_el8.6.0+3031+fb177b09
  • mod_proxy_html
    Fixed in 1:2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • mod_session
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • mod_ssl
    Fixed in 1:2.4.37-56.module_el8.8.0+3605+a3cf1030.7

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • httpd
    Fixed in 2.4.57-5.el9
  • httpd-core
    Fixed in 2.4.57-5.el9
  • httpd-devel
    Fixed in 2.4.57-5.el9
  • httpd-filesystem
    Fixed in 2.4.57-5.el9
  • httpd-manual
    Fixed in 2.4.57-5.el9
  • httpd-tools
    Fixed in 2.4.57-5.el9
  • mod_ldap
    Fixed in 2.4.57-5.el9
  • mod_lua
    Fixed in 2.4.57-5.el9
  • mod_proxy_html
    Fixed in 1:2.4.57-5.el9
  • mod_session
    Fixed in 2.4.57-5.el9
  • mod_ssl
    Fixed in 1:2.4.57-5.el9

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • httpd
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • httpd-devel
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • httpd-filesystem
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • httpd-manual
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • httpd-tools
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • mod_http2
    Fixed in 1.15.7-8.module_el8.8.0+3554+ec1058a7.3
  • mod_ldap
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • mod_md
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
    • Affected before 1:2.0.8-8.module_el8.6.0+3031+fb177b09
  • mod_proxy_html
    Fixed in 1:2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • mod_session
    Fixed in 2.4.37-56.module_el8.8.0+3605+a3cf1030.7
  • mod_ssl
    Fixed in 1:2.4.37-56.module_el8.8.0+3605+a3cf1030.7

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • httpd
    Fixed in 2.4.57-5.el9
  • httpd-core
    Fixed in 2.4.57-5.el9
  • httpd-devel
    Fixed in 2.4.57-5.el9
  • httpd-filesystem
    Fixed in 2.4.57-5.el9
  • httpd-manual
    Fixed in 2.4.57-5.el9
  • httpd-tools
    Fixed in 2.4.57-5.el9
  • mod_ldap
    Fixed in 2.4.57-5.el9
  • mod_lua
    Fixed in 2.4.57-5.el9
  • mod_proxy_html
    Fixed in 1:2.4.57-5.el9
  • mod_session
    Fixed in 2.4.57-5.el9
  • mod_ssl
    Fixed in 1:2.4.57-5.el9

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • apache2
    Fixed in 2.4.56-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • apache2
    Fixed in 2.4.56-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • apache2
    Fixed in 2.4.56-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • apache2
    Fixed in 2.4.41-4ubuntu3.14

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • apache2
    Fixed in 2.4.52-1ubuntu4.4

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.