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CVE-2021-39240

HIGH
7.5
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
HIGH7.5
Exploit prediction
EPSS 2%

Description

An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It does not ensure that the scheme and path portions of a URI have the expected characters. For example, the authority field (as observed on a target HTTP/2 server) might differ from what the routing rules were intended to achieve.

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%
2.2.0 ≤ v < 2.2.162.3.0 ≤ v < 2.3.132.4.0 ≤ v < 2.4.3
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 (6)

x_refsource_MISC
Source: [email protected]
https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=4b8852c70d8c4b7e225e24eb58258a15eb54c26e
x_refsource_MISC
Source: [email protected]
https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=a495e0d94876c9d39763db319f609351907a31e8
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

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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