high
7.5
CWE
190
Advisory Published
Updated

CVE-2021-40346: Integer Overflow

First published: Wed Sep 08 2021(Updated: )

An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
debian/haproxy
1.8.19-1+deb10u3
1.8.19-1+deb10u4
2.2.9-2+deb11u5
2.6.12-1
2.6.15-1
Haproxy Haproxy>=2.0.0<2.0.25
Haproxy Haproxy>=2.2.0<2.2.17
Haproxy Haproxy>=2.3.0<2.3.14
Haproxy Haproxy>=2.4.0<2.4.4
Haproxy Haproxy=2.5-dev0
Haproxy Haproxy=2.5-dev1
Haproxy Haproxy=2.5-dev2
Haproxy Haproxy=2.5-dev3
Haproxy Haproxy=2.5-dev4
Haproxy Haproxy=2.5-dev5
Haproxy Haproxy=2.5-dev6
Debian Debian Linux=11.0
Fedoraproject Fedora=33
Fedoraproject Fedora=34

Remedy

https://git.haproxy.org/?p=haproxy.git

Remedy

https://github.com/haproxy/haproxy/commit/3b69886f7dcc3cfb3d166309018e6cfec9ce2c95

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Reference Links

Frequently Asked Questions

  • What is the vulnerability ID for this HAProxy integer overflow vulnerability?

    The vulnerability ID for this HAProxy integer overflow vulnerability is CVE-2021-40346.

  • What is the severity of CVE-2021-40346?

    CVE-2021-40346 has a severity rating of 7.5 (high).

  • How does the integer overflow vulnerability in HAProxy 2.0 through 2.5 impact security?

    The integer overflow vulnerability in HAProxy 2.0 through 2.5 can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.

  • Which versions of HAProxy are affected by CVE-2021-40346?

    HAProxy versions 2.0 through 2.5 are affected by CVE-2021-40346.

  • How can I mitigate the CVE-2021-40346 vulnerability in HAProxy?

    To mitigate the CVE-2021-40346 vulnerability in HAProxy, upgrade to the fixed versions, such as 1.8.19-1+deb10u3, 1.8.19-1+deb10u4, 2.2.9-2+deb11u5, 2.6.12-1, or 2.6.15-1 depending on your HAProxy version.

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