CVE-2021-3449

CVE-2021-3449 affects OpenSSL 1.1.1.x where a TLSv1.2 server may crash (DoS) if it receives a renegotiation ClientHello that omits the signature_algorithms extension but includes signature_algorithms_cert. The issue is a NULL pointer dereference leading to a denial of service; OpenSSL clients are...

CVE-2021-31894

CVE-2021-31894 affects Siemens SIMATIC PCS 7 family, PDM, STEP 7, and SINAMICS STARTER with write-permission metafiles. The issue stems from an incorrect permission assignment for a critical resource (metafile directory), allowing an attacker to alter metafile contents and subsequently influence ...

CVE-2021-31893

CVE-2021-31893 affects Siemens SIMATIC PCS 7 family and related tools (PCS 7 v8.2 and earlier; PCS 7 v9.0 prior to SP3; PDM prior to v9.2; STEP 7 v5.X prior to v5.6 SP2 HF3; SINAMICS STARTER prior to v5.4 HF2) and is caused by a buffer overflow when handling certain files. This can allow a local ...