An integer underflow has been found in the latest version of ZCFees.
Priority LOW 36CWE-191Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
An integer underflow has been found in the latest version of ZCFees. The variables 'currPeriodIdx' and 'lastPeriodExecIdx' are both unsigned integers, and the result of the minus operation may be a negative integer which leads to an underflow. The attackers can modify the current timestamp of the transaction somehow and block the execution of the process function.
Why it matters now
EPSS 0.01636 76th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:zcfees_project:zcfees:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Zcfees Project |
- cpe:2.3:a:zcfees_project:zcfees:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Zcfees Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-24837
- 2026-10-03 Alias added: GHSA-qwpm-85r5-4m77
Sources
- CVE-2020-24837 · CVE Program
- CVE-2020-24837 · NVD
- FIRST EPSS
- GHSA-qwpm-85r5-4m77 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences