Buffer overflow in the Centralized TFTP File Locator Service in Cisco Unified Communications Manager (CUCM, formerly CallManager) 5.1 before 5.1(3), and Unified CallManager 5.0, allows remote attackers to execute arbitrary code or cause a denial of service via unspecified vectors involving the processing of filenames, aka CSCsh47712.
Conclusion & alert: CVE-2007-5538 is rated High Risk (69.9/100): CVSS Critical severity, with high exploitation likelihood (EPSS 5.53%, 92th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 7.79% | 5.53% | -2.25% |
| 2 | 2026-06-06 | 7.51% | 7.79% | +0.28% |
| 3 | 2025-03-30 | — | 7.51% | — |
Full EPSS history (10 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 10.0 | 2.0 | HIGH |
|
10.0 | 10.0 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| cisco | unified_callmanager | 5.0 | cpe:2.3:a:cisco:unified_callmanager:5.0:*:*:*:*:*:*:* |
| cisco | unified_communications_manager | <= 5.1\(2\) | cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:*:*:*:* |