What is CVE-2025-31135?

CVE-2025-31135 is a medium-severity vulnerability in Phires Go-Guerrilla, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2025-04-01.

How severe is CVE-2025-31135?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Improper input validation in Phires Go-Guerrilla

CVE-2025-31135

Go-Guerrilla SMTP Daemon is a lightweight SMTP server written in Go. Prior to 1.6.7, when ProxyOn is enabled, the PROXY command will be accepted multiple times, with later invocations overriding earlier ones. The proxy protocol only supports one initial PROXY header; anything after that is considered part of the exchange between client and server, so the client is free to send further PROXY commands with whatever data it pleases. go-guerrilla will treat these as coming from the reverse proxy, allowing a client to spoof its IP address. This vulnerability is fixed in 1.6.7.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.004 (28.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Phires Go-guerrilla — versions < 1.6.7

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-31135?: CVE-2025-31135 is a medium-severity vulnerability in Phires Go-Guerrilla, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2025-04-01.
How severe is CVE-2025-31135?: Medium severity. CVSS v3 base score is 5.3 out of 10.