Medium 5.0Published Dec 1, 2003

CVE-2003-0851OpenSSL 0.9.6k allows remote attackers to cause a denial of service (crash via large recursion) via malformed ASN.1 sequences.

Updated under an hour ago (Nov 2, 2026, 12:10 AM ET)

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It affects cisco ios and 4 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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

CVSS: 5.0 MEDIUM (v2.0, NVD)AV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

cisco ios cisco:ios	12.1(11)e; 12.1(11b)e; 12.2sx; 12.2sy	NVD
cisco css11000_content_services_switch cisco:css11000_content_services_switch	all versions	NVD
cisco pix_firewall cisco:pix_firewall	6.2.2_.111	NVD
openssl openssl openssl:openssl	0.9.6; 0.9.6a; 0.9.6b; 0.9.6c; 0.9.6d; 0.9.6e; 0.9.6f; 0.9.6g; and 7 more ranges	NVD
cisco pix_firewall_software cisco:pix_firewall_software	6.0; 6.0(1); 6.0(2); 6.0(3); 6.0(4); 6.0(4.101); 6.1; 6.1(1); and 10 more ranges	NVD

References

References

http://marc.info/?l=bugtraq&m=106796246511667&w=2
http://marc.info/?l=bugtraq&m=108403850228012&w=2
http://rhn.redhat.com/errata/RHSA-2004-119.html
http://secunia.com/advisories/17381
http://www.cisco.com/warp/public/707/cisco-sa-20030930-ssl.shtml
http://www.kb.cert.org/vuls/id/412478	patch, third-party-advisory, us-government-resource
http://www.openssl.org/news/secadv_20031104.txt	patch, vendor-advisory
http://www.redhat.com/archives/fedora-announce-list/2005-October/msg00087.html
http://www.securityfocus.com/bid/8970	patch, vendor-advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5528

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.