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CVE-2003-0851

16
FAUCET Score

CVE-2003-0851 describes a denial-of-service vulnerability in OpenSSL versions 0.9.6k and earlier, impacting various Cisco products including IOS and PIX Firewalls. The vulnerability allows remote attackers to crash affected systems by sending malformed ASN.1 sequences, leading to excessive recursion. With a CVSS score of 5.0, it is a low-severity issue requiring no authentication, but only resulting in availability impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage for this older vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
12.1\(11\)eCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.1\(11\)e:*:*:*:*:*:*:*
12.1\(11b\)eCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.1\(11b\)e:*:*:*:*:*:*:*
12.2sxCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.2sx:*:*:*:*:*:*:*
12.2syCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.2sy:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:cisco:css11000_content_services_switch:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
5.41%
Probability of exploitation in next 30 days
EPSS Percentile
91.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0541 is in the 89th percentile among its peer group of 23,701 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux AS (Advanced Server) version 2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux ES version 2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux WS version 2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux Advanced Workstation 2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Stronghold 4
View patch

Vendor Advisories (1)

redhatCVE-2003-0851Important

security flaw

Nov 4, 2003

References

ftp.netbsd.org / pub/NetBSD/security/advisories/NetBSD-SA2004-003.txt.asc
patches.sgi.com / support/free/security/advisories/20040304-01-U.asc
marc.info
marc.info
rhn.redhat.com / errata/RHSA-2004-119.html
secunia.com / advisories/17381
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5528
cisco.com / warp/public/707/cisco-sa-20030930-ssl.shtml
kb.cert.org / vuls/id/412478
PatchThird Party AdvisoryUS Government Resource
openssl.org / news/secadv_20031104.txt
PatchVendor Advisory
redhat.com / archives/fedora-announce-list/2005-October/msg00087.html
securityfocus.com / bid/8970
PatchVendor Advisory