OpenSSL does not use RSA blinding by default, which allows local and remote attackers to obtain the server's private key by determining factors using timing differences on (1) the number of extra reductions during Montgomery reduction, and (2) the use of different integer multiplication algorithms ("Karatsuba" and normal).
Conclusion & alert: CVE-2003-0147 is rated Moderate Risk (55.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 28.74%, 96th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +2.05% over the last day, indicating growing attacker interest. 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 | 2026-02-27 | 26.68% | 28.74% | +2.05% |
| 2 | 2026-01-28 | 24.49% | 26.68% | +2.19% |
| 3 | 2026-01-20 | — | 24.49% | — |
Full EPSS history (21 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2003-0147 not yet assigned priority: Debian including 1 source packages (openssl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2003-0147 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2003-0147 |
ubuntu
|
medium | CVE-2003-0147 medium priority: Ubuntu including 2 source packages (openssl, openssl097), 8 status rows across 4 suites (dapper, edgy, feisty, upstream): released 6, needs-triage 2. | https://ubuntu.com/security/CVE-2003-0147 |
Red Hat Enterprise Linux 5 is not vulnerable to this issue as it contains a backported patch.
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| openpkg | openpkg | — | cpe:2.3:a:openpkg:openpkg:*:*:*:*:*:*:*:* |
| openpkg | openpkg | 1.1 | cpe:2.3:a:openpkg:openpkg:1.1:*:*:*:*:*:*:* |
| openpkg | openpkg | 1.2 | cpe:2.3:a:openpkg:openpkg:1.2:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.6 | cpe:2.3:a:openssl:openssl:0.9.6:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.6a | cpe:2.3:a:openssl:openssl:0.9.6a:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.6b | cpe:2.3:a:openssl:openssl:0.9.6b:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.6c | cpe:2.3:a:openssl:openssl:0.9.6c:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.6d | cpe:2.3:a:openssl:openssl:0.9.6d:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.6e | cpe:2.3:a:openssl:openssl:0.9.6e:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.6g | cpe:2.3:a:openssl:openssl:0.9.6g:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.6h | cpe:2.3:a:openssl:openssl:0.9.6h:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.6i | cpe:2.3:a:openssl:openssl:0.9.6i:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.7 | cpe:2.3:a:openssl:openssl:0.9.7:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.7a | cpe:2.3:a:openssl:openssl:0.9.7a:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.7 | cpe:2.3:a:stunnel:stunnel:3.7:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.8 | cpe:2.3:a:stunnel:stunnel:3.8:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.9 | cpe:2.3:a:stunnel:stunnel:3.9:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.10 | cpe:2.3:a:stunnel:stunnel:3.10:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.11 | cpe:2.3:a:stunnel:stunnel:3.11:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.12 | cpe:2.3:a:stunnel:stunnel:3.12:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.13 | cpe:2.3:a:stunnel:stunnel:3.13:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.14 | cpe:2.3:a:stunnel:stunnel:3.14:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.15 | cpe:2.3:a:stunnel:stunnel:3.15:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.16 | cpe:2.3:a:stunnel:stunnel:3.16:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.17 | cpe:2.3:a:stunnel:stunnel:3.17:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.18 | cpe:2.3:a:stunnel:stunnel:3.18:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.19 | cpe:2.3:a:stunnel:stunnel:3.19:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.20 | cpe:2.3:a:stunnel:stunnel:3.20:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.21 | cpe:2.3:a:stunnel:stunnel:3.21:*:*:*:*:*:*:* |
| stunnel | stunnel | 3.22 | cpe:2.3:a:stunnel:stunnel:3.22:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.0 | cpe:2.3:a:stunnel:stunnel:4.0:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.01 | cpe:2.3:a:stunnel:stunnel:4.01:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.02 | cpe:2.3:a:stunnel:stunnel:4.02:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.03 | cpe:2.3:a:stunnel:stunnel:4.03:*:*:*:*:*:*:* |
| stunnel | stunnel | 4.04 | cpe:2.3:a:stunnel:stunnel:4.04:*:*:*:*:*:*:* |