Worker-pool crash via unchecked global replacements
Published Apr 9, 2025 · Updated Apr 23, 2025
Heap-based buffer overflow in HAProxy 2.2 through 3.1.6 allows remote attackers to crash all workers via crafted request data. The sample_conv_regsub function checks remaining space in the output buffer but copies each expanded global replacement into the unchecked temporary trash buffer. Exposure requires a configuration that globally replaces multiple short matches with a longer static string; the replacement is not attacker-controlled, limiting the demonstrated impact to service interruption.
Summary
What happened
Heap-based buffer overflow in HAProxy 2.2 through 3.1.6 allows remote attackers to crash all workers via crafted request data. The sample_conv_regsub function checks remaining space in the output buffer but copies each expanded global replacement into the unchecked temporary trash buffer. Exposure requires a configuration that globally replaces multiple short matches with a longer static string; the replacement is not attacker-controlled, limiting the demonstrated impact to service interruption.
The record
- CVE
- CVE-2025-32464
- Published
- Apr 9, 2025
- Updated
- Apr 23, 2025
- Vendor
- HAProxy Technologies
- Product
- HAProxy
- Classifications
- CWE-1025, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 9, 2025CVE publishedPublication date reported by the CVE source.
- Apr 23, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.2 <=3.1.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Codean Labs HAProxy regsub crash proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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