Distribution advisory
This page covers CVE-2025-5994 as tracked by Ubuntu, for the package unbound. The fix is available in version 1.22.0-2ubuntu1; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity high, availability none.
CVSS metrics in full
The score comes from this vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/R:U/V:C
- Attack vector: Network — reachable from anywhere that can route to the service.
- Attack complexity: Low — the attack works reliably, with no preparation.
- Attack requirements: None — no deployment-specific condition has to hold.
- Privileges required: None — an unauthenticated stranger can try it.
- User interaction: None — nobody has to be tricked into anything.
- Confidentiality impact: None.
- Integrity impact: High — total loss, or loss the attacker controls.
- Availability impact: None.
Weakness class
UBUNTU-CVE-2025-5994 is classified as CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data. The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted.
Affected software
UBUNTU-CVE-2025-5994 is recorded against 1 package.
- unbound (fixed in 1.22.0-2ubuntu1)
Timeline and source
Published on 17 July 2025 and last revised on 2 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
ubuntu.com (Report)
www.cve.org (Report)
nlnetlabs.nl (Report)
ubuntu.com (Advisory)
Other advisories for this package
unbound 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-349: Acceptance of Extraneous Untrusted Data With Trusted Data) in other software:
