CVE-2021-39818 Adobe InCopy Memory Corruption Vulnerability Could Lead to Arbitrary Code Execution
Attackers can execute arbitrary code by tricking users into opening a malicious TIFF file in Adobe InCopy.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-39818?
CVE-2021-39818 is a high-severity memory corruption vulnerability in Adobe Incopy, published on 27 Sep 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Adobe InCopy version 11.1 (and earlier) is affected by a memory corruption vulnerability due to insecure handling of a malicious TIFF file, potentially resulting in arbitrary code execution in the context of the current user. User interaction is required to exploit this vulnerability.
Which versions are affected by CVE-2021-39818?
It affects 1 product.
Products include Adobe Incopy.
How do I fix CVE-2021-39818?
No fix has been published for CVE-2021-39818 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-39818 being exploited?
There is no known exploitation of CVE-2021-39818 in the wild and no public exploit code.
Other vulnerabilities in Adobe Incopy
- CVE-2021-21090 Adobe InCopy DOCX file parsing directory traversal vulnerability could lead to remote code execution
- CVE-2026-34706 InCopy | Out-of-bounds Write (CWE-787)
- CVE-2026-34707 InCopy | Heap-based Buffer Overflow (CWE-122)
- CVE-2026-34708 InCopy | Stack-based Buffer Overflow (CWE-121)
- CVE-2026-27287 InCopy | Out-of-bounds Read (CWE-125)
Sources
Also known as GHSA-3gmv-cppr-wxpg.