A vulnerability was found in FastCMS 0.1.5.
CVE-2025-3177 is a high-severity vulnerability in FastCMS, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected FastCMS versions: 0.1.5. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.49% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of FastCMS you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 2.3 | Low | CNA (vuldb.com) |
| CVSS 3.1 | 5.0 | Medium | CNA (vuldb.com) |
| CVSS 3.1 | 8.1 | High | NVD |
| CVSS 2.0 | 4.6 | Medium | CNA (vuldb.com) |
Official description
A vulnerability was found in FastCMS 0.1.5. It has been declared as critical. This vulnerability affects unknown code of the component JWT Handler. The manipulation leads to use of hard-coded cryptographic key . The attack can be initiated remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- vuldb.com/?ctiid.303136Permissions Required, Third Party Advisory, VDB Entry
- vuldb.com/?id.303136Third Party Advisory, VDB Entry
- vuldb.com/?submit.543673Third Party Advisory, VDB Entry
Technical write-ups (may include proof of concept)
- github.com/chujianxin0101/vuln/issues/2Exploit, Issue Tracking, Third Party Advisory
Other vulnerabilities in FastCMS
- 7.2 High severity
- 9.8 Critical severity
- 8.8 High severity
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