CVE-2025-21156 InCopy | Integer Underflow (Wrap or Wraparound) (CWE-191)
An integer underflow in Adobe InCopy allows arbitrary code execution if a user opens a malicious file.
- 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-2025-21156?
CVE-2025-21156 is a high-severity vulnerability in Adobe Incopy, published on 11 Feb 2025. 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
InCopy versions 20.0, 19.5.1 and earlier are affected by an Integer Underflow (Wrap or Wraparound) vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Weakness: CWE-191
Which versions are affected by CVE-2025-21156?
It affects 1 product.
Products include Adobe Incopy.
How do I fix CVE-2025-21156?
No fix has been published for CVE-2025-21156 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-21156 being exploited?
There is no known exploitation of CVE-2025-21156 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-q2q4-vx5m-7xc9.