#VU107481 Improper Authorization in nats-server - CVE-2025-30215

Vulnerability identifier: #VU107481

Vulnerability risk: Medium

CVSSv4.0: 5.4 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:H/E:P/U:Green]

CVE-ID: CVE-2025-30215

CWE-ID: CWE-285

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
nats-server
Server applications / Other server solutions

Vendor: NATS - The Cloud Native Messaging System

Description

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to the failure to authorize certain Jetstream admin APIs. A remote user can perform certain administrative actions on any JS asset in any other account.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

nats-server: 2.2.0 - 2.11.0

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External links
https://www.openwall.com/lists/oss-security/2025/04/08/5
https://advisories.nats.io/CVE/secnote-2025-01.txt
https://github.com/nats-io/nats-server/security/advisories/GHSA-fhg8-qxh5-7q3w

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.