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CVE-2003-0543

33
FAUCET Score

CVE-2003-0543 describes an integer overflow vulnerability in OpenSSL versions 0.9.6 and 0.9.7. This flaw allows remote attackers to trigger a denial of service by providing a specially crafted SSL client certificate containing malformed ASN.1 tag values, leading to a crash. The vulnerability has a CVSS score of 5.0, indicating a medium severity, with low attack complexity and no authentication required, but only impacts availability. While there is no evidence of active exploitation, a brute-forcer for parsing bugs related to this vulnerability exists on ExploitDB, though it has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
0.9.6CPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.6:*:*:*:*:*:*:*
0.9.7CPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.7:*:*:*:*:*:*:*

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
24.65%
Probability of exploitation in next 30 days
EPSS Percentile
97.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-146 · Oct 9, 2003
This CVE's current EPSS score of 0.2465 is in the 98th percentile among its peer group of 23,705 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 (11)

redhatpatch availablevia redhat_api
Product: Red Hat Stronghold 4
View patch
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 7.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux 7.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux 7.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux 8.0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux 9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux Advanced Workstation 2.1
View patch
redhatvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2003-0543Moderate

CAN-2003-0543/0544 OpenSSL ASN.1 protocol crashes

Sep 30, 2003

References

bugzilla.redhat.com / bugzilla/show_bug.cgi
Vendor Advisory
secunia.com / advisories/22249
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4254
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5292
sunsolve.sun.com / search/document.do
www-1.ibm.com / support/docview.wss
cert.org / advisories/CA-2003-26.html
US Government Resource
debian.org / security/2003/dsa-393
debian.org / security/2003/dsa-394
kb.cert.org / vuls/id/255484
US Government Resource
linuxsecurity.com / advisories/engarde_advisory-3693.html
redhat.com / support/errata/RHSA-2003-291.html
PatchVendor Advisory
redhat.com / support/errata/RHSA-2003-292.html
securityfocus.com / bid/8732
uniras.gov.uk / vuls/2003/006489/openssl.htm
vupen.com / english/advisories/2006/3900