How severe is CVE-2003-0543?

CVE-2003-0543 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2003-0543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 25% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-0543?

CVE-2003-0543 primarily affects Openssl. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2003-0543?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2003-0543 published?

CVE-2003-0543 was published on 2003-11-17 and last updated on 2026-06-16.

CVE-2003-0543

CVE-2003-0543 is a medium-severity vulnerability in Openssl with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 25% places it in the 98th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 25% (98th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Openssl
Published: 2003-11-17
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2003-0543?: CVE-2003-0543 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2003-0543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 25% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0543?: CVE-2003-0543 primarily affects Openssl. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-0543?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2003-0543 published?: CVE-2003-0543 was published on 2003-11-17 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:openssl:openssl:0.9.6:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7:*:*:*:*:*:*:*

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