CVE-2021-39242
First published: Tue Aug 17 2021(Updated: )
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 can lead to a situation with an attacker-controlled HTTP Host header, because a mismatch between Host and authority is mishandled.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Haproxy Haproxy | >=2.2.0<2.2.16 | |
| Haproxy Haproxy | >=2.3.0<2.3.13 | |
| Haproxy Haproxy | >=2.4.0<2.4.3 | |
| Debian Debian Linux | =11.0 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| 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 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://www.mail-archive.com/haproxy@formilux.org/msg41041.html
- https://git.haproxy.org/?p=haproxy.git;a=commit;h=b5d2b9e154d78e4075db163826c5e0f6d31b2ab1
- https://security-tracker.debian.org/tracker/CVE-2021-39242
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4ALECUZDIMT5FYGP6V6PVSI4BKVZTZWN/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RPNY4WZIQUAUOCLIMUPC37AQWNXTWIQM/
- https://www.debian.org/security/2021/dsa-4960
- https://www.mail-archive.com/haproxy%40formilux.org/msg41041.html
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=b5d2b9e154d78e4075db163826c5e0f6d31b2ab1
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPNY4WZIQUAUOCLIMUPC37AQWNXTWIQM/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ALECUZDIMT5FYGP6V6PVSI4BKVZTZWN/
Frequently Asked Questions
What is the vulnerability ID of this issue in HAProxy?
The vulnerability ID of this issue in HAProxy is CVE-2021-39242.
What is the severity of CVE-2021-39242?
The severity of CVE-2021-39242 is high with a CVSS score of 7.5.
How does the vulnerability in HAProxy occur?
The vulnerability in HAProxy occurs due to mishandling of a mismatch between Host and authority when an attacker-controlled HTTP Host header is present.
Which versions of HAProxy are affected by CVE-2021-39242?
HAProxy versions before 2.2.16, 2.3.13, and 2.4.3 are affected by CVE-2021-39242.
Where can I find more information about CVE-2021-39242?
More information about CVE-2021-39242 can be found at the following references: [link1](https://git.haproxy.org/?p=haproxy.git;a=commit;h=b5d2b9e154d78e4075db163826c5e0f6d31b2ab1), [link2](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4ALECUZDIMT5FYGP6V6PVSI4BKVZTZWN/), [link3](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RPNY4WZIQUAUOCLIMUPC37AQWNXTWIQM/)
- collector/security-tracker-debian
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/severity
- agent/weakness
- agent/author
- agent/last-modified-date
- agent/remedy
- agent/tags
- agent/description
- agent/first-publish-date
- agent/event
- package-manager/debian
- vendor/haproxy
- canonical/haproxy haproxy
- version/haproxy haproxy/2.2.0
- version/haproxy haproxy/2.3.0
- version/haproxy haproxy/2.4.0
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/11.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/33
- version/fedoraproject fedora/34