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CVE-2023-25725

CRITICALCVSS 9.1/10EPSS 5.49%

Last modified

CVE-2023-25725 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka "request smuggling." The HTTP header parsers in HAProxy may accept empty header field names, which could be used to truncate the list of HTTP headers and thus make some headers disappear after being parsed and processed for HTTP/1.0 and HTTP/1.1. For HTTP/2 and HTTP/3, the impact is limited because the headers disappear before being parsed and processed, as if they had not been sent by the client. EPSS estimates a 5.49% chance of exploitation in the next 30 days.

Description

HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka "request smuggling." The HTTP header parsers in HAProxy may accept empty header field names, which could be used to truncate the list of HTTP headers and thus make some headers disappear after being parsed and processed for HTTP/1.0 and HTTP/1.1. For HTTP/2 and HTTP/3, the impact is limited because the headers disappear before being parsed and processed, as if they had not been sent by the client. The fixed versions are 2.7.3, 2.6.9, 2.5.12, 2.4.22, 2.2.29, and 2.0.31.

Metrics

CVSS 3.1
9.1/10

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

EPSS Probability
5.49%

91.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
HaproxyHaproxy< 2.0.31
HaproxyHaproxy>= 2.1.0, < 2.2.29
HaproxyHaproxy>= 2.3.0, < 2.4.22
HaproxyHaproxy>= 2.5.0, < 2.5.12
HaproxyHaproxy>= 2.6.0, < 2.6.9
HaproxyHaproxy>= 2.7.0, < 2.7.3
DebianDebian Linux10.0
DebianDebian Linux11.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-25725?
HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka "request smuggling." The HTTP header parsers in HAProxy may accept empty header field names, which could be used to truncate the list of HTTP headers and thus make some headers disappear after being parsed and processed for HTTP/1.0 and HTTP/1.1. For HTTP/2 and HTTP/3, the impact is limited because the headers disappear before being parsed and processed, as if they had not been sent by the client. The fixed versions are 2.7.3, 2.6.9, 2.5.12, 2.4.22, 2.2.29, and 2.0.31.
How severe is CVE-2023-25725?
CVE-2023-25725 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 5.49% probability of exploitation in the next 30 days.
How do I fix CVE-2023-25725?
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-2023-25725?

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

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Source: NVD / NIST