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CVE-2021-39241

MEDIUM
5.3
CVSS Score
Published: August 17, 2021 at 06:33 PM UTC
Updated: June 17, 2026 at 04:03 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraHAProxy

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Severity
MEDIUM5.3
Exploit prediction
EPSS 2%

Description

An issue was discovered in HAProxy 2.0 before 2.0.24, 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. An HTTP method name may contain a space followed by the name of a protected resource. It is possible that a server would interpret this as a request for that protected resource, such as in the "GET /admin? HTTP/1.1 /static/images HTTP/1.1" example.

Affected

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

Debian Linux· Debiandrupal
95%
11.0
Fedora· Fedora Projectrpm
95%
3334
HAProxy· Haproxy
95%
2.0.0 ≤ v < 2.0.242.2.0 ≤ v < 2.2.162.3.0 ≤ v < 2.3.132.4.0 ≤ v < 2.4.3
Affected range stops below 2.0.24, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.2.16, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.3.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.4.3, so it looks safe — our inference, not a vendor statement

References (5)

x_refsource_MISC
Source: [email protected]
https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=89265224d314a056d77d974284802c1b8a0dc97f
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ALECUZDIMT5FYGP6V6PVSI4BKVZTZWN/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPNY4WZIQUAUOCLIMUPC37AQWNXTWIQM/
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2021/dsa-4960
x_refsource_MISC
Source: [email protected]
https://www.mail-archive.com/haproxy%40formilux.org/msg41041.html

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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