CVE-2025-66399
CVE-2025-66399 is a high-severity vulnerability in Cacti with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-77.
Key facts
- Severity: High (CVSS 3.x base score 8.8)
- CVSS v4: 7.4
- EPSS exploit prediction: 11% (95th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-200287
- Weakness: CWE-77
- Affected product: Cacti
- Published:
- Last modified:
Description
Cacti is an open source performance and fault management framework. Prior to 1.2.29, there is an input-validation flaw in the SNMP device configuration functionality. An authenticated Cacti user can supply crafted SNMP community strings containing control characters (including newlines) that are accepted, stored verbatim in the database, and later embedded into backend SNMP operations. In environments where downstream SNMP tooling or wrappers interpret newline-separated tokens as command boundaries, this can lead to unintended command execution with the privileges of the Cacti process. This vulnerability is fixed in 1.2.29.
Frequently asked questions
- What is CVE-2025-66399?
- Cacti is an open source performance and fault management framework. Prior to 1.2.29, there is an input-validation flaw in the SNMP device configuration functionality. An authenticated Cacti user can supply crafted SNMP community strings containing control characters (including newlines) that are accepted, stored verbatim in the database, and later embedded into backend SNMP operations. In environments where downstream SNMP tooling or wrappers interpret newline-separated tokens as command boundaries, this can lead to unintended command execution with the privileges of the Cacti process. This vulnerability is fixed in 1.2.29.
- How severe is CVE-2025-66399?
- CVE-2025-66399 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2025-66399 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-66399?
- CVE-2025-66399 affects Cacti. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-66399?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2025-66399 have an EU (EUVD) identifier?
- Yes. CVE-2025-66399 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200287.
- When was CVE-2025-66399 published?
- CVE-2025-66399 was published on 2025-12-02 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:cacti:cacti:*:*:*:*:*:*:*:*
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