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Vulnerabilities

Vulnerability · CVE-2003-0543

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.

Published Nov 17, 2003 · catalog updated Jun 16, 2026 · Integer overflow in OpenSSL

Last checked Nov 4, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2003-0543 is not in CISA KEV. FIRST estimates a 27.37% chance of exploitation in the next 30 days. Check whether you run Integer overflow in OpenSSL.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Integer overflow in OpenSSL).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
27.37%
Remediation
Advisory link
Affected products
cpe openssl/openssl

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe openssl/openssl0.9.6
  • cpe openssl/openssl0.9.7

How to fix CVE-2003-0543

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2003-0543 is not in CISA KEV. FIRST estimates a 27.37% chance of exploitation in the next 30 days. Check whether you run Integer overflow in OpenSSL.

Which versions are affected?

Compare what you have installed with 0.9.6, 0.9.7. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 27.37%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

OpenSSL security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 17, 2003 · Monitored products — critical

    Detected

    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.

  2. Jun 16, 2026 · Monitored products — critical

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2003-0543

    Official CVE identifier

    cve.org
  • Monitored products — criticalVendor advisoryCVE-2003-0543

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 4, 2026