Strix
26.1K

CVE-2021-39242

HIGHCVSS 7.5/10EPSS 2.32%

Last modified

CVE-2021-39242 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.32% chance of exploitation in the next 30 days.

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 can lead to a situation with an attacker-controlled HTTP Host header, because a mismatch between Host and authority is mishandled.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability
2.32%

81.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
HaproxyHaproxy>= 2.2.0, < 2.2.16
HaproxyHaproxy>= 2.3.0, < 2.3.13
HaproxyHaproxy>= 2.4.0, < 2.4.3
DebianDebian Linux11.0
FedoraprojectFedora33
FedoraprojectFedora34

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-39242?
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.
How severe is CVE-2021-39242?
CVE-2021-39242 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.32% probability of exploitation in the next 30 days.
How do I fix CVE-2021-39242?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39242?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST