CVE-2025-34310: IPFire < v2.29 Stored XSS via Quality of Service (QoS) Settings

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-28 · updated 2026-10-19
Weakness: CWE-79

Description

IPFire versions prior to 2.29 (Core Update 198) contain a stored cross-site scripting (XSS) vulnerability that allows an authenticated attacker to inject arbitrary JavaScript code through the INC_SPD, OUT_SPD, DEFCLASS_INC, and DEFCLASS_OUT parameters when updating Quality of Service (QoS) settings. When a user updates speeds or classes, the application issues an HTTP POST request to /cgi-bin/qos.cgi and the values for incoming/outgoing speeds and default classes are provided in the INC_SPD, OUT_SPD, DEFCLASS_INC, and DEFCLASS_OUT parameters. The values of these parameters are stored and later rendered in the web interface without proper sanitation or encoding, allowing injected scripts to execute in the context of other users who view the affected QoS entries.

Affected products

IPFire.org IPFire: before 2.29; 2.29-core_update183, 2.29-core_update184, 2.29-core_update185, 2.29-core_update186, 2.29-core_update187, 2.29-core_update188 (+9) — fixed in 2.29

How to fix

Upgrade to a fixed version: IPFire.org IPFire 2.29. Check the vendor advisory for mitigations.

References

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