CVE-2023-27522 json
Apache HTTP Server: mod_proxy_uwsgi HTTP response splitting
published 2023-03-07 3 y ago modified 2026-09-08 2 mo ago also BIT-apache-2023-27522 , EUVD-2023-1108 , GHSA-vcph-37mh-fqrh , PYSEC-2026-1058
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.1%
- EPSS 2.1% chance of exploitation in 30 days, percentile 82%
- public exploits
- 0
- none known
Summary
HTTP Response Smuggling vulnerability in Apache HTTP Server via mod_proxy_uwsgi. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.55.
Special characters in the origin response header can truncate/split the response forwarded to the client.
Patch / fix
- pypi uwsgi 2.0.22
- bitnami apache 2.4.56
- apache http_server 2.4.56
- unbit uwsgi 2.0.22
- apache2 Debian 14, Debian 13, Debian 12 2.4.56-1
debian advisories DEBIAN-CVE-2023-27522
- apache2 Ubuntu 20.04 LTS 2.4.41-4ubuntu3.14
- apache2 Ubuntu 22.04 LTS 2.4.52-1ubuntu4.4
ubuntu advisories UBUNTU-CVE-2023-27522
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- jbcs-httpd24-apr jboss core services 1 1.7.0-8.el7jbcs
- jbcs-httpd24-apr jboss core services 1 1.7.0-8.el8jbcs
- jbcs-httpd24-curl jboss core services 1 8.2.1-1.el7jbcs
- jbcs-httpd24-curl jboss core services 1 8.2.1-1.el8jbcs
- jbcs-httpd24-httpd jboss core services 1 2.4.57-5.el7jbcs
- jbcs-httpd24-httpd jboss core services 1 2.4.57-5.el8jbcs
- jbcs-httpd24-libcurl jboss core services 1 8.2.1-1.el7jbcs
- jbcs-httpd24-libcurl jboss core services 1 8.2.1-1.el8jbcs
red hat advisories RHSA-2023:4629RHSA-2024:4504RHSA-2023:6403RHSA-2023:5049RHSA-2023:5050
- apache2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.4.66-150400.6.57.1
- apache2 SLE Module for Server Applications 15 SP4, SLE Module for Package Hub 15 SP4, SLE Module for Basesystem 15 SP4 +1 more 2.4.51-150400.6.11.1
- apache2 SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +9 more 2.4.51-150200.3.56.1
- apache2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.4.51-35.25.1
- apache2 SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 2.4.33-150000.3.75.1
suse advisories SUSE-SU-2026:2686-1SUSE-SU-2023:1658-1SUSE-SU-2023:1573-1SUSE-SU-2023:0799-1SUSE-SU-2023:0764-1
- apache2 openSUSE Tumbleweed 2.4.56-1.1
opensuse advisories openSUSE-SU-2024:12776-1
- httpd AlmaLinux 9 2.4.57-5.el9
- mod_lua AlmaLinux 9 2.4.57-5.el9
- mod_ssl AlmaLinux 9 1:2.4.57-5.el9
- mod_ldap AlmaLinux 9 2.4.57-5.el9
- httpd-core AlmaLinux 9 2.4.57-5.el9
- httpd-tools AlmaLinux 9 2.4.57-5.el9
- mod_session AlmaLinux 9 2.4.57-5.el9
- httpd-manual AlmaLinux 9 2.4.57-5.el9
almalinux advisories ALSA-2023:6403ALSA-2023:5050
- httpd Rocky Linux 8 2.4.37-56.module+el8.8.0+1284+07ef499e.6
- mod_md Rocky Linux 8 1:2.0.8-8.module+el8.8.0+1271+9ed9553d
- mod_http2 Rocky Linux 8 1.15.7-8.module+el8.8.0+1284+07ef499e.3
rocky linux advisories RLSA-2023:5050
- apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 2.4.56-r0
alpine advisories ALPINE-CVE-2023-27522
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- github.com/apache/httpd@d753ea7 commit
- github.com/unbit/uwsgi@58ee1df commit
- github.com/unbit/uwsgi@acb0353 commit
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-2023-27522 updated cvss 7.5
httpd: mod_proxy_uwsgi HTTP response splitting
-
Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +1 more Red Hat JBoss Enterprise Application Platform 6 httpd22 httpd22affected: workaround, no fix planned “Out of support scope”
-
Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-8.module+el8.3.0+6814+67d1e611, httpd 2.4.37-56.module+el8.8.0+19808+379766d6.7, mod_ssl 2.4.37-56.module+el8.8.0+19808+379766d6.7, mod_http2 1.15.7-8.module+el8.8.0+18751+b4557bca.3, mod_ldap 2.4.37-56.module+el8.8.0+19808+379766d6.7, httpd-tools 2.4.37-56.module+el8.8.0+19808+379766d6.7, +4 morefixed: vendor fix RHSA-2023:5050
-
Red Hat Enterprise Linux AppStream (v. 9) httpd 2.4.57-5.el9, mod_lua 2.4.57-5.el9, mod_ssl 2.4.57-5.el9, mod_ldap 2.4.57-5.el9, httpd-core 2.4.57-5.el9, httpd-tools 2.4.57-5.el9, +4 morefixed: vendor fix RHSA-2023:6403
-
Red Hat Enterprise Linux AppStream EUS (v.8.6) mod_md 2.0.8-8.module+el8.3.0+6814+67d1e611, httpd 2.4.37-47.module+el8.6.0+19809+6e655c60.7, mod_ssl 2.4.37-47.module+el8.6.0+19809+6e655c60.7, mod_http2 1.15.7-5.module+el8.6.0+18506+34b194fb.2, mod_ldap 2.4.37-47.module+el8.6.0+19809+6e655c60.7, httpd-tools 2.4.37-47.module+el8.6.0+19809+6e655c60.7, +4 morefixed: vendor fix RHSA-2023:5049
-
Red Hat Enterprise Linux AppStream EUS (v.9.2) httpd 2.4.53-11.el9_2.6, mod_lua 2.4.53-11.el9_2.6, mod_ssl 2.4.53-11.el9_2.6, mod_ldap 2.4.53-11.el9_2.6, httpd-core 2.4.53-11.el9_2.6, httpd-tools 2.4.53-11.el9_2.6, +4 morefixed: vendor fix RHSA-2024:4504
-
Red Hat JBoss Core Services 2.4.57fixed: vendor fix RHSA-2023:4628
-
Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.57-5.el7jbcs, jbcs-httpd24-mod_ssl 2.4.57-5.el7jbcs, jbcs-httpd24-mod_ldap 2.4.57-5.el7jbcs, jbcs-httpd24-httpd-tools 2.4.57-5.el7jbcs, jbcs-httpd24-mod_session 2.4.57-5.el7jbcs, jbcs-httpd24-httpd-manual 2.4.57-5.el7jbcs, +2 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd 2.4.57-5.el8jbcs, jbcs-httpd24-mod_ssl 2.4.57-5.el8jbcs, jbcs-httpd24-mod_ldap 2.4.57-5.el8jbcs, jbcs-httpd24-httpd-tools 2.4.57-5.el8jbcs, jbcs-httpd24-mod_session 2.4.57-5.el8jbcs, jbcs-httpd24-httpd-manual 2.4.57-5.el8jbcs, +2 morefixed: vendor fix RHSA-2023:4629
-
Red Hat Enterprise Linux AppStream (v. 9) mod_http2 1.15.19-5.el9 Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.7.0-8.el7jbcs, jbcs-httpd24-curl 8.2.1-1.el7jbcs, jbcs-httpd24-libcurl 8.2.1-1.el7jbcs, jbcs-httpd24-mod_md 2.4.0-25.el7jbcs, jbcs-httpd24-apr-util 1.6.1-102.el7jbcs, jbcs-httpd24-mod_http2 1.15.19-28.el7jbcs, +11 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-apr 1.7.0-8.el8jbcs, jbcs-httpd24-curl 8.2.1-1.el8jbcs, jbcs-httpd24-libcurl 8.2.1-1.el8jbcs, jbcs-httpd24-mod_md 2.4.0-25.el8jbcs, jbcs-httpd24-apr-util 1.6.1-102.el8jbcs, jbcs-httpd24-mod_http2 1.15.19-28.el8jbcs, +11 more Red Hat Software Collections httpd24-httpd, httpd24-mod_md, httpd24-mod_ssl, httpd24-mod_ldap, httpd24-httpd-tools, httpd24-mod_session, +2 morenot 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 ICSA-26-027-02 updated cvss 7.5
Festo Didactic SE MES PC
-
Festo Didactic SE MES PC shipped_with_Windows_10affected: vendor fix
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
cisa ICSA-25-133-01 updated cvss 7.5
Hitachi Energy Service Suite
-
Hitachi Energy Service Suite <=9.8.1.3affected: fixed in 9.8.1.4
-
Hitachi Energy Service Suite 9.8.1.4fixed
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
cisa ICSA-24-046-15 updated cvss 7.5
Siemens SINEC NMS
-
Siemens SINEC NMS <V2.0_SP1affected: fixed in V2.0 support.industry.siemens.com
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
cisa ICSA-24-046-11 updated cvss 7.5
Siemens SCALANCE XCM-/XRM-300
-
Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4affected: fixed in V2.4 support.industry.siemens.com
+5 more productsfewer
Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
2.13% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | uwsgi | <2.0.22 |
2.0.22 |
| bitnami | apache | >=2.4.30, <2.4.56 |
2.4.56 |
Affected products
- Apache Software Foundation Apache HTTP Server
- apache http_server
Classification
- Weakness
-
- CWE-444 Inconsistent Interpretation of HTTP Requests
- Technology feeds
References
-
github.com
/apache/httpd/commit/d753ea76b5972a85349b68c31b59d04c60014f2d
web
-
github.com
/unbit/uwsgi/commit/58ee1df31fa9e9af106aaeabb82374c36b433822
web
-
github.com
/unbit/uwsgi/commit/acb03530aaaeaa810f28a5b64da619525940f569
web
-
httpd.apache.org
/security/vulnerabilities_24.html
vendor-advisory, web, advisory
-
lists.debian.org
/debian-lts-announce/2023/04/msg00028.html
web, third-party-advisory, advisory
-
security.gentoo.org
/glsa/202309-01
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2023-27522
advisory, web
-
github.com
/unbit/uwsgi
package
-
uwsgi-docs.readthedocs.io
/en/latest/Changelog-2.0.22.html
web
-
github.com
/advisories/GHSA-vcph-37mh-fqrh
web, advisory
-
pypi.org
/project/uwsgi
package
Sources
- CVE List CVE-2023-27522
- GitHub Advisory GHSA-vcph-37mh-fqrh
- NVD CVE-2023-27522
- OSV BIT-apache-2023-27522
- OSV PYSEC-2026-1058
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.
CPEs and fixed versions use Anchore's correction of NVD's data: Improve version ranges to indicate fix.