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Fencer Vulns
medium 5.0

CVE-2003-0543 json

Integer overflow in OpenSSL 0.9.6 and 0.9.7 allows remote attackers to cause a denial of service (crash) via an SSL client certificate with…

published 2003-10-01 23 y ago modified 2026-06-16 4 mo ago also EUVD-2003-0537

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
27.4%
EPSS 27.4% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

Summary

Integer overflow in OpenSSL 0.9.6 and 0.9.7 allows remote attackers to cause a denial of service (crash) via an SSL client certificate with certain ASN.1 tag values.

Patch / fix

  • openssl Debian 14, Debian 13, Debian 12 0.9.7c

debian advisories DEBIAN-CVE-2003-0543

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2003-0543 updated

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

  • Red Hat Enterprise Linux ES version 2.1 Red Hat Enterprise Linux WS version 2.1
    fixed: vendor fix RHSA-2003:293
  • Red Hat Linux 7.1 Red Hat Linux 7.2 Red Hat Linux 7.3 Red Hat Linux 8.0
    fixed: vendor fix RHSA-2003:291
  • Red Hat Linux 9
    fixed: vendor fix RHSA-2003:292
  • Red Hat Linux Advanced Workstation 2.1
    fixed: vendor fix RHSA-2003:293
  • Red Hat Stronghold 4
    fixed: vendor fix RHSA-2003:290

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-146)

Exploit prediction

27.37% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-146 OpenSSL ASN.1 < 0.9.6j/0.9.7b - Brute Forcer for Parsing Bugs dos, 2003-10-09

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.