Security News > 2021 > May > Adobe: Windows Users Hit by PDF Reader Zero-Day
Adobe on Tuesday warned that a gaping security hole in one of the most widely deployed software products has been exploited in the wild in "Limited attacks targeting Adobe Reader users on Windows."
Adobe's confirmation of the zero-day attack was buried in a security bulletin that documents at least 11 security vulnerabilities affected Adobe Acrobat and Reader on both Windows and MacOS platforms.
Adobe's Acrobat Reader is widely used freeware to view, create, fill, print and format files in the Portable Document Format.
The under-attack flaw - CVE-2021-28550 - is described as a use-after-free memory corruption issue that was discovered and reported anonymously to Adobe.
The mega-patch release from Adobe documents at least 23 flaws in a range of products, including a pair of security holes in the Adobe Experience Manager, a trio of security flaws in Adobe InDesign and five serious bugs in Adobe Illustrator.
The company also patched security vulnerabilities in Adobe InCopy and Adobe Genuine Service.
News URL
Related news
- Microsoft patches Windows Kernel zero-day exploited since 2023 (source)
- Unpatched Windows Zero-Day Flaw Exploited by 11 State-Sponsored Threat Groups Since 2017 (source)
- New Windows zero-day exploited by 11 state hacking groups since 2017 (source)
- APTs have been using zero-day Windows shortcut exploit for eight years (ZDI-CAN-25373) (source)
- EncryptHub linked to MMC zero-day attacks on Windows systems (source)
- New Windows zero-day leaks NTLM hashes, gets unofficial patch (source)
- EncryptHub Exploits Windows Zero-Day to Deploy Rhadamanthys and StealC Malware (source)
- Microsoft: Windows CLFS zero-day exploited by ransomware gang (source)
- Microsoft fixes actively exploited Windows CLFS zero-day (CVE-2025-29824) (source)
- PipeMagic Trojan Exploits Windows Zero-Day Vulnerability to Deploy Ransomware (source)
Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2021-09-02 | CVE-2021-28550 | Use After Free vulnerability in Adobe products Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier) and 2017.011.30194 (and earlier) are affected by a Use After Free vulnerability. | 8.8 |