CVE-2003-0851

OpenSSL 0.9.6k allows remote attackers to cause a denial of service (crash via large recursion) via malformed ASN.1 sequences.

Published: 2003-12-01 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2003-0851 is rated Moderate Risk (53.2/100): CVSS Medium severity, with high exploitation likelihood (EPSS 5.41%, 92th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.17% over the last day, indicating growing attacker interest. 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.

Exploit prediction scoring system (EPSS) score for CVE-2003-0851

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 4.24% 5.41% +1.17%
2 2026-03-02 7.20% 4.24% -2.96%
3 2025-12-28 — 7.20% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2003-0851

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2003-0851

OS Trackers for CVE-2003-0851

vendor priority summary link
redhat high — https://access.redhat.com/security/cve/CVE-2003-0851
ubuntu medium CVE-2003-0851 medium priority: Ubuntu including 1 source packages (openssl096), 1 status rows across 1 suites (upstream): needs-triage 1. https://ubuntu.com/security/CVE-2003-0851

Affected software / configurations for CVE-2003-0851

Vendor Product Version Raw CPE
cisco ios 12.1\(11\)e cpe:2.3:o:cisco:ios:12.1\(11\)e:*:*:*:*:*:*:*
cisco ios 12.1\(11b\)e cpe:2.3:o:cisco:ios:12.1\(11b\)e:*:*:*:*:*:*:*
cisco ios 12.2sx cpe:2.3:o:cisco:ios:12.2sx:*:*:*:*:*:*:*
cisco ios 12.2sy cpe:2.3:o:cisco:ios:12.2sy:*:*:*:*:*:*:*
cisco css11000_content_services_switch — cpe:2.3:a:cisco:css11000_content_services_switch:*:*:*:*:*:*:*:*
cisco pix_firewall 6.2.2_.111 cpe:2.3:a:cisco:pix_firewall:6.2.2_.111:*:*:*:*:*:*:*
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 0.9.6f cpe:2.3:a:openssl:openssl:0.9.6f:*:*:*:*:*:*:*
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 0.9.6j cpe:2.3:a:openssl:openssl:0.9.6j:*:*:*:*:*:*:*
openssl openssl 0.9.6k cpe:2.3:a:openssl:openssl:0.9.6k:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
openssl openssl 0.9.7b cpe:2.3:a:openssl:openssl:0.9.7b:*:*:*:*:*:*:*
cisco pix_firewall_software 6.0 cpe:2.3:o:cisco:pix_firewall_software:6.0:*:*:*:*:*:*:*
cisco pix_firewall_software 6.0\(1\) cpe:2.3:o:cisco:pix_firewall_software:6.0\(1\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.0\(2\) cpe:2.3:o:cisco:pix_firewall_software:6.0\(2\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.0\(3\) cpe:2.3:o:cisco:pix_firewall_software:6.0\(3\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.0\(4\) cpe:2.3:o:cisco:pix_firewall_software:6.0\(4\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.0\(4.101\) cpe:2.3:o:cisco:pix_firewall_software:6.0\(4.101\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.1 cpe:2.3:o:cisco:pix_firewall_software:6.1:*:*:*:*:*:*:*
cisco pix_firewall_software 6.1\(1\) cpe:2.3:o:cisco:pix_firewall_software:6.1\(1\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.1\(2\) cpe:2.3:o:cisco:pix_firewall_software:6.1\(2\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.1\(3\) cpe:2.3:o:cisco:pix_firewall_software:6.1\(3\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.1\(4\) cpe:2.3:o:cisco:pix_firewall_software:6.1\(4\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.1\(5\) cpe:2.3:o:cisco:pix_firewall_software:6.1\(5\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.2 cpe:2.3:o:cisco:pix_firewall_software:6.2:*:*:*:*:*:*:*
cisco pix_firewall_software 6.2\(1\) cpe:2.3:o:cisco:pix_firewall_software:6.2\(1\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.2\(2\) cpe:2.3:o:cisco:pix_firewall_software:6.2\(2\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.2\(3\) cpe:2.3:o:cisco:pix_firewall_software:6.2\(3\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.3\(1\) cpe:2.3:o:cisco:pix_firewall_software:6.3\(1\):*:*:*:*:*:*:*
cisco pix_firewall_software 6.3\(3.102\) cpe:2.3:o:cisco:pix_firewall_software:6.3\(3.102\):*:*:*:*:*:*:*

References for CVE-2003-0851

cvelogic Threat Intelligence