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🛡️ CVE-2025-55129 — revive-adserver

🟡 CVSS 5.4 — Medium ⚠️ Exploit Public CWE-176 NVD
5.4
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

HackerOne community member Kassem S.(kassem_s94) has reported that username handling in Revive Adserver was still vulnerable to impersonation attacks after the fix for CVE-2025-52672, via several alternate techniques. Homoglyphs based impersonation has been independently reported by other HackerOne users, such as itz_hari_ and khoof.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: None.

Weakness class

CVE-2025-55129 is classified as CWE-176: Improper Handling of Unicode Encoding. The product does not properly handle when an input contains Unicode encoding.

Affected software

CVE-2025-55129 is recorded against 1 package.

  • revive-adserver (from 6.0.0 up to 6.0.4)

Timeline and source

Published on 2 December 2025 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

hackerone.com

Other advisories for this package

revive-adserver has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-176: Improper Handling of Unicode Encoding) in other software:

Details

Severity MEDIUM
CVSS Score 5.4
CVSS Vector CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE CWE-176
Public Exploit ⚠️ Yes
Source NVD
Published 2025-12-02
Updated 2026-08-20
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
revive-adserver 6.0.0 6.0.4

References

Exploit, Issue Tracking, Third Party Advisory https://hackerone.com/reports/3434156

Similar Threats

Exploit Protection

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CVE-2025-55129 carries CVSS 5.4 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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