
CVE-2026-34621 Adobe Acrobat PDF Zero-Day, 5-Month Gap
Adobe Acrobat Reader CVE-2026-34621: prototype pollution zero-day exploited by APT for 5 months before emergency patch APSB26-43.
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8 results tagged APT

Adobe Acrobat Reader CVE-2026-34621: prototype pollution zero-day exploited by APT for 5 months before emergency patch APSB26-43.

CVE-2023-27997 is a pre-authentication heap buffer overflow in the Fortinet FortiOS SSL-VPN component enabling unauthenticated remote code execution on FortiGate VPN appliances. Exploited as a zero-day before Fortinet's June 2023 advisory, it affects FortiOS 6.0 through 7.2.4 with SSL-VPN enabled. CISA linked related Fortinet exploitation to Chinese state-sponsored actor Volt Typhoon targeting US critical infrastructure.

CVE-2022-1388 is a critical authentication bypass vulnerability in the F5 BIG-IP iControl REST management API. Unauthenticated attackers with network access to the management interface can execute arbitrary OS commands as root by manipulating HTTP headers to bypass the API authentication layer. Mass exploitation began within 24 hours of F5's advisory. CISA and FBI issued a joint advisory warning of active exploitation.
CVE-2020-14882 is a critical authentication bypass in the Oracle WebLogic Server web-based administration console. Chained with CVE-2020-14883, it enables unauthenticated remote code execution on one of the most widely deployed Java EE application servers in enterprise environments. Exploitation began within days of Oracle's October 2020 Critical Patch Update and was adopted by nation-state actors and ransomware operators.

CVE-2020-5902 is a critical remote code execution vulnerability in the F5 BIG-IP Traffic Management User Interface (TMUI). An unauthenticated attacker with network access to the TMUI can execute arbitrary system commands, create or delete files, enable or disable services, and fully compromise the BIG-IP device. With a CVSS score of 10.0, this vulnerability was exploited within hours of F5's advisory.

CVE-2019-19781 is a pre-authentication path traversal vulnerability in Citrix ADC (NetScaler ADC) and Citrix Gateway that allows unauthenticated attackers to execute arbitrary OS commands. Exploited at mass scale before patches were released, it was used by nation-state APT groups and ransomware operators to compromise enterprise and government VPN gateways worldwide.

CVE-2019-11510 is a pre-authentication arbitrary file read vulnerability in Pulse Connect Secure VPN appliances. An unauthenticated attacker can retrieve the VPN's configuration file and stored credentials, including plaintext passwords and cached Active Directory credentials, from any affected device reachable on the internet. Widely exploited by ransomware groups, APTs, and credential brokers.

CVE-2018-13379 is a pre-authentication path traversal vulnerability in the Fortinet FortiOS SSL VPN web portal. An unauthenticated attacker can read system files from the VPN appliance by crafting a malicious URL, including session files that contain plaintext credentials. Credentials from over 87,000 FortiGate devices were published publicly in 2021, many from devices patched but with credentials never rotated.