The key validation code in GnuPG before 1.2.2 does not properly determine the validity of keys with multiple user IDs and assigns the greatest validity of the most valid user ID, which prevents GnuPG from warning the encrypting user when a user ID does not have a trusted path.
Conclusion & alert: CVE-2003-0255 is rated High Risk (71.2/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 4.21%). 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 | 2026-04-24 | 4.10% | 4.21% | +0.11% |
| 2 | 2026-03-25 | 5.43% | 4.10% | -1.33% |
| 3 | 2025-07-13 | — | 5.43% | — |
Full EPSS history (11 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 | priority | summary | link |
|---|---|---|---|
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2003-0255 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| gnu | privacy_guard | <= 1.2.1 | cpe:2.3:a:gnu:privacy_guard:*:*:*:*:*:*:*:* |