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CVE-2023-27522

Apache HTTP Server: mod_proxy_uwsgi HTTP response splitting

HIGH

7.5

CVSS Score

Published: March 7, 2023 at 03:09 PM UTC

Updated: June 17, 2026 at 05:45 AM UTC

3 products affected across 3 vendorsDebian LinuxHTTP ServerUwsgi

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Severity

HIGH7.5

Exploit prediction

EPSS 2%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

HTTP Server · Apache

95%

2.4.30 ≤ v ≤ 2.4.552.4.30

Affected range stops below 2.4.56, so it looks safe — our inference, not a vendor statement

Debian Linux · Debiandrupal

95%

95%

v < 2.0.22

Affected range stops below 2.0.22, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://httpd.apache.org/security/vulnerabilities_24.html

References (3)

Vendor Advisory

Source: [email protected]

https://httpd.apache.org/security/vulnerabilities_24.html

Third Party Advisory

Source: [email protected]

https://lists.debian.org/debian-lts-announce/2023/04/msg00028.html

Third Party Advisory

Source: [email protected]

https://security.gentoo.org/glsa/202309-01

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-444

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