Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH_check() performs various checks on DH parameters. After fixing CVE-2023-3446 it was discovered that a large q parameter value can also trigger an overly long computation during some of these checks. A correct q value, if present, cannot be larger than the modulus p parameter, thus it is unnecessary to perform these checks if q is larger than p. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. The function DH_check() is itself called by a number of other OpenSSL functions. An application calling any of those other functions may similarly be affected. The other functions affected by this are DH_check_ex() and EVP_PKEY_param_check(). Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications when using the "-check" option. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.
Fix
Patch, vendor advisory and mitigation references on NVD 8
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5 Mailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f Mailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5 Mailing List, Patch
- https://www.openssl.org/news/secadv/20230731.txt Vendor Advisory
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5 Mailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f Mailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5 Mailing List, Patch
- https://www.openssl.org/news/secadv/20230731.txt Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.3 · opensslNVD modified 2026-10-14 22:17
Affected (CPE criteria) 69
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2:-:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2:beta1:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2:beta2:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2:beta3:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2a:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2b:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2c:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2d:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2e:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2f:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2g:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2h:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2i:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2j:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2k:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2l:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2m:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2n:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2o:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2p:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2q:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2r:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2s:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2t:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2u:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2v:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2w:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2x:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2y:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2za:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2zb:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2zc:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2zd:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2ze:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2zf:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2zg:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.0.2zh:*:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.1.1:-:*:*:*:*:*:*cpe:2.3:a:openssl:openssl:1.1.1:pre1:*:*:*:*:*:*- and 29 more
References 24
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5 Mailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644 Broken Link
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f Mailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5 Mailing List, Patch
- https://www.openssl.org/news/secadv/20230731.txt Vendor Advisory
- http://seclists.org/fulldisclosure/2023/Jul/43
- http://www.openwall.com/lists/oss-security/2023/07/31/1
- http://www.openwall.com/lists/oss-security/2023/09/22/11
- http://www.openwall.com/lists/oss-security/2023/09/22/9
- http://www.openwall.com/lists/oss-security/2023/11/06/2
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5 Mailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644 Broken Link
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f Mailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5 Mailing List, Patch
- https://lists.debian.org/debian-lts-announce/2023/08/msg00019.html
- https://security.gentoo.org/glsa/202402-08
- https://security.netapp.com/advisory/ntap-20230818-0014/
- https://security.netapp.com/advisory/ntap-20231027-0008/
- https://security.netapp.com/advisory/ntap-20240621-0006/
- https://www.openssl.org/news/secadv/20230731.txt Vendor Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-099606.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-915275.html
- https://cert-portal.siemens.com/productcert/html/ssa-943925.html