← Vulnerability feed

Vulnerability record · CVE-2003-0543 · published 17 November 2003

CVE-2003-0543: Openssl vulnerability

OOpenssl · 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.

5.0 CVSS 2.0 Medium EPSS 27% · top 2.0%
5.0CVSS 2.0 base score
27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
32References
16 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=104893 Vendor Advisory
http://secunia.com/advisories/22249
http://sunsolve.sun.com/search/document.do?assetkey=1-66-201029-1
http://www-1.ibm.com/support/docview.wss?uid=swg21247112
http://www.cert.org/advisories/CA-2003-26.html US Government Resource
http://www.debian.org/security/2003/dsa-393
http://www.debian.org/security/2003/dsa-394
http://www.kb.cert.org/vuls/id/255484 US Government Resource
http://www.linuxsecurity.com/advisories/engarde_advisory-3693.html
http://www.redhat.com/support/errata/RHSA-2003-291.html PatchVendor Advisory
http://www.redhat.com/support/errata/RHSA-2003-292.html
http://www.securityfocus.com/bid/8732
http://www.uniras.gov.uk/vuls/2003/006489/openssl.htm
http://www.vupen.com/english/advisories/2006/3900
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4254
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5292
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=104893 Vendor Advisory
http://secunia.com/advisories/22249
http://sunsolve.sun.com/search/document.do?assetkey=1-66-201029-1
http://www-1.ibm.com/support/docview.wss?uid=swg21247112
http://www.cert.org/advisories/CA-2003-26.html US Government Resource
http://www.debian.org/security/2003/dsa-393
http://www.debian.org/security/2003/dsa-394
http://www.kb.cert.org/vuls/id/255484 US Government Resource
http://www.linuxsecurity.com/advisories/engarde_advisory-3693.html
http://www.redhat.com/support/errata/RHSA-2003-291.html PatchVendor Advisory
http://www.redhat.com/support/errata/RHSA-2003-292.html
http://www.securityfocus.com/bid/8732
http://www.uniras.gov.uk/vuls/2003/006489/openssl.htm
http://www.vupen.com/english/advisories/2006/3900
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4254
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5292

Track CVE-2003-0543 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2014-0160OpenSSL TLS/DTLS Heartbeat Extension Out-of-Bounds Read (Heartbleed)OpenSSL 1.0.1 before 1.0.1g mishandles Heartbeat Extension packets in its TLS and DTLS implementations, causing an out-of-bounds read of process memo…KEVEPSS 100%analysed10.0CVE-2009-3245Openssl improper input validation vulnerabilityOpenSSL before 0.9.8m does not check for a NULL return value from bn_wexpand function calls in (1) crypto/bn/bn_div.c, (2) crypto/bn/bn_gf2m.c, (3) c…EPSS 6.5%10.0CVE-2006-3738OpenSSL SSL_get_shared_ciphers buffer overflow via long cipher listOpenSSL versions before 0.9.7l and 0.9.8d contain a buffer overflow in the SSL_get_shared_ciphers function, triggered by a long list of ciphers. The …EPSS 49%analysed9.8CVE-2026-63073Openssl vulnerabilityIssue summary: OpenSSL CMP response validation passed an unexpected response sender distinguished name directly as the format string to `ERR_raise_da…EPSS 1.2%9.8CVE-2026-31789Openssl out-of-bounds write vulnerabilityIssue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact…EPSS 0.33%9.8CVE-2022-2274OpenSSL 3.0.4 RSA AVX512IFMA memory corruptionOpenSSL 3.0.4 introduced a bug in the RSA implementation for X86_64 CPUs supporting AVX512IFMA instructions, causing 2048-bit private key operations …EPSS 46%analysed9.8CVE-2021-3711OpenSSL SM2 decryption buffer overflowOpenSSL's SM2 decryption code miscalculates the output buffer size needed by EVP_PKEY_decrypt(), so the first sizing call can return a value smaller …EPSS 88%analysed9.8CVE-2016-6309OpenSSL 1.1.0a statem use-after-free on realloc in TLS session handlingOpenSSL 1.1.0a's statem/statem.c fails to account for memory-block movement after a realloc call, leaving a dangling pointer that can be used after f…EPSS 70%analysed

Source: NIST National Vulnerability Database (record CVE-2003-0543), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.