OpenSSL before 0.9.8l, and 0.9.8m through 1.x, does not properly restrict client-initiated renegotiation within the SSL and TLS protocols, which might make it easier for remote attackers to cause a denial of service (CPU consumption) by performing many renegotiations within a single connection, a different vulnerability than CVE-2011-5094. NOTE: it can also be argued that it is the responsibility of server deployments, not a security library, to prevent or limit renegotiation when it is inappropriate within a specific environment
Conclusion & alert: CVE-2011-1473 is rated Moderate Risk (59.7/100): CVSS Medium severity, with high exploitation likelihood (EPSS 67.70%, 99th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +12.22% 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 | 2026-06-15 | 55.49% | 67.70% | +12.22% |
| 2 | 2026-05-18 | 64.64% | 55.49% | -9.15% |
| 3 | 2026-05-08 | — | 64.64% | — |
Full EPSS history (65 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 |
|---|---|---|---|
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2011-1473 |
ubuntu
|
low | CVE-2011-1473 low priority: Ubuntu including 2 source packages (openssl, openssl098), 16 status rows across 8 suites (hardy, lucid, maverick, natty, oneiric, precise, quantal, upstream): ignored 10, DNE 4, needs-triage 2. | https://ubuntu.com/security/CVE-2011-1473 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| openssl | openssl | 0.9.8m | cpe:2.3:a:openssl:openssl:0.9.8m:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.8m | cpe:2.3:a:openssl:openssl:0.9.8m:beta1:*:*:*:*:*:* |
| openssl | openssl | 0.9.8n | cpe:2.3:a:openssl:openssl:0.9.8n:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.8o | cpe:2.3:a:openssl:openssl:0.9.8o:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.8p | cpe:2.3:a:openssl:openssl:0.9.8p:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.8r | cpe:2.3:a:openssl:openssl:0.9.8r:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.8s | cpe:2.3:a:openssl:openssl:0.9.8s:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.8t | cpe:2.3:a:openssl:openssl:0.9.8t:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.8u | cpe:2.3:a:openssl:openssl:0.9.8u:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.8v | cpe:2.3:a:openssl:openssl:0.9.8v:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.8w | cpe:2.3:a:openssl:openssl:0.9.8w:*:*:*:*:*:*:* |
| openssl | openssl | 0.9.8x | cpe:2.3:a:openssl:openssl:0.9.8x:*:*:*:*:*:*:* |
| openssl | openssl | <= 0.9.8k | cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* |