CVE-2026-25687 json
ZCC race condition in ZPA tunnel handler
published last mo. modified last mo. also EUVD-2026-77536
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
Summary
A race condition in the ZPA tunnel handler of affected versions of Zscaler Client Connector (ZCC) allows a heap corruption, resulting in a denial of service (client crash) and potentially arbitrary code execution in the context of the ZCC process.
Patch / fix
- Zscaler Client Connector 4.6.0.486, 4.7.0.350, 4.8.0.267, 4.9.0.412
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- last mo.
Exploit prediction
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Zscaler Client Connector
Classification
- Weakness
-
- CWE-366 Race Condition within a Thread
References
Sources
- CVE List CVE-2026-25687
- NVD CVE-2026-25687
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