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CVE-2026-75805

MEDIUM(5.3)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Risk Signal Score13/100 — NIEDRIG
  • CVSS 5.3 — Mittel

Erwähnungen (letzte 60 Tage)

Artikel

EPSS-Score

0.2%

Exploit-Wahrscheinlichkeit (30 Tage)

CVSS Score

5.3

Technische Schwere

Beschreibung

Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr <file>' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API. A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash. The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a certificate or by issuer and serial number rather than by a PKCS#10 CSR are not affected. FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside the OpenSSL FIPS module boundary.

Betroffene Produkte

  • cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
  • cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
  • cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
  • cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
  • cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*

Referenzen