CyberSecBulletin
CVE-2025-66499NVD status: Analyzed

Foxit PDF Reader: Integer Overflow or Wraparound

Published Updated By the CyberSecBulletin desk

CVE-2025-66499 is a high-severity integer overflow or wraparound vulnerability in Foxit PDF Reader from Foxit, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected Foxit PDF Reader versions: Versions 2025.2.1 and earlier; Versions 14.0.1 and earlier; Versions 13.2.1 and eariler. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.3% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of Foxit PDF Reader you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on foxit.com for workarounds and exact fixed builds.
  3. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
Foxit SoftwareFoxit PDF ReaderVersions 2025.2.1 and earlier; Versions 14.0.1 and earlier; Versions 13.2.1 and earilerNot stated
Foxit SoftwareFoxit PDF EditorVersions 2025.2.1 and earlier; Versions 14.0.1 and earlier; Versions 13.2.1 and earilerNot stated
FoxitPDF Editor13.2.1.23955 and earlier; 14.0.0.33046 through 14.0.1.33197; 2023.1.0.15510 through 2023.3.0.23028; 2024.1.0.23997 through 2024.4.1.27687; 2025.1.0.27937 through 2025.2.1.33197; 13.2.1.63315 and earlier; 14.0.0.33046 through 14.0.1.69005; 2023.1.0.15510 through 2023.3.0.63083; and 2 more rangesNot stated
FoxitPDF Reader2025.2.1.33197 and earlier; 2025.2.1.69005 and earlierNot stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by CNA.

Official description

A heap-based buffer overflow vulnerability exists in the PDF parsing of Foxit PDF Reader when processing specially crafted JBIG2 data. An integer overflow in the calculation of the image buffer size may occur, potentially allowing a remote attacker to execute arbitrary code.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How developers prevent this class of flaw

  • Ensure that all protocols are strictly defined, such that all out-of-bounds behavior can be identified simply, and require strict conformance to the protocol.
  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. If possible, choose a language or compiler that performs automatic bounds checking.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Use libraries or frameworks that make it easier to handle numbers without unexpected consequences. Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++).

More Integer Overflow or Wraparound vulnerabilities (CWE-190)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Foxit PDF Reader

All Foxit PDF Reader vulnerabilities

Recent Integer Overflow or Wraparound vulnerabilities

Spotted an error? Tell us.