Threat Advisory

OpenSSL Vulnerability Enables Remote Code Execution

Threat: Vulnerability
Targeted Region: Global
Targeted Sector: Technology & IT
Criticality: High
[subscribe_to_unlock_form]

EXECUTIVE SUMMARY:

Multiple security vulnerabilities have been identified in OpenSSL across its 1.1.1, 3.0, and 4.0 branches (including 1.1.1zh and 4.0.1). The defects span remote code execution, use‑after‑free memory corruption, cryptographic nonce reuse, and denial‑of‑service conditions in the QUIC stack. Unauthenticated attackers can send crafted TLS/PKCS#7 payloads to trigger code execution or crash services, while flawed cipher interfaces expose confidential data to forgery. The combined impact threatens the confidentiality, integrity, and availability of corporate communications, potentially leading to service outages, data leakage, and loss of trust in critical security infrastructure.[/subscribe_to_unlock_form]

EXECUTIVE SUMMARY:

Multiple security vulnerabilities have been identified in OpenSSL across its 1.1.1, 3.0, and 4.0 branches (including 1.1.1zh and 4.0.1). The defects span remote code execution, use‑after‑free memory corruption, cryptographic nonce reuse, and denial‑of‑service conditions in the QUIC stack. Unauthenticated attackers can send crafted TLS/PKCS#7 payloads to trigger code execution or crash services, while flawed cipher interfaces expose confidential data to forgery. The combined impact threatens the confidentiality, integrity, and availability of corporate communications, potentially leading to service outages, data leakage, and loss of trust in critical security infrastructure.[emaillocker id="1283"]

  • CVE-2026-50751 – Critical Check Point VPN vulnerability actively exploited in the wild, allowing unauthenticated attackers to gain VPN access and pivot within corporate networks.
  • CVE-2026-45447 – A heap‑based use‑after‑free in PKCS#7 verification that can be triggered by sending a crafted signed message, enabling remote code execution on vulnerable OpenSSL instances.
  • CVE-2026-34182 – Validation failure in Cryptographic Message Services that permits crafted encrypted messages to bypass integrity checks and potentially reveal confidential keys.
  • CVE-2026-45445 – Nonce reuse bug in the AES‑OCB one‑shot API that discards the IV, causing identical nonces across messages and leading to loss of confidentiality and possible tag forgery.
  • CVE-2026-34183 – Unbounded allocation in the QUIC stack where malicious peers can flood PATH_CHALLENGE frames, exhausting heap memory and causing server crashes.
  • CVE-2026-42764 – NULL pointer dereference triggered by an invalid QUIC token when client address validation is disabled, resulting in a denial‑of‑service crash.
  • CVE-2026-42765 – NULL pointer dereference during partial‑chain certificate verification when a self‑signed anchor is missing, causing immediate service termination.
  • CVE-2026-35188 – Double‑free condition in certificate status evaluation that can be induced via crafted OCSP responses, leading to application crashes.

These OpenSSL flaws collectively present a high‑severity threat to any organization that relies on TLS for secure communications. If exploited, attackers can achieve remote code execution, compromise encrypted data, or cause prolonged service outages, undermining customer confidence and regulatory compliance. Immediate attention is required to prevent potentially catastrophic business disruption.

RECOMMENDATION:

  • We recommend you to update OpenSSL to version 4.0.1 or 1.1.1zh.

REFERENCES:

The following reports contain further technical details:
https://securityonline.info/openssl-security-patches-rce/

[/emaillocker]
crossmenu