CVE-2025-64740: Zoom Workplace VDI Client for Windows - Improper Verification of Cryptographic Signature

6

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.1% (30-day exploitation probability)+0
Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.1%

ahead of 1% of scored CVEs · Oct 14, 2026

Affects

Zoom

Workplace Virtual Desktop Infrastructure and 1 more

CVSS base

7.8

High · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

No

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Zoom Workplace Virtual Desktop Infrastructure, Zoom Communications Inc. Zoom Workplace VDI Client).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (cryptography), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Zoom	Workplace Virtual Desktop Infrastructure	< 6.3.14≥ 6.4.10 and < 6.4.12	Vulnerable	NIST National Vulnerability Database
Zoom Communications Inc.	Zoom Workplace VDI Client	version see references	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.8	CVSS 3.1	High	1.8	5.9	nvd@nist.gov via NIST National Vulnerability Database
7.5	CVSS 3.1	High	0.8	6.0	security@zoom.us via NIST National Vulnerability Database
7.5	CVSS 3.1	High	—	—	Zoom via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Scoring entities (NIST, CNA, ADP) score independently; each score is shown with its origin. For prioritization we use 7.8 (NVD (NIST)) as a conservative provisional reference — not a definitive official score.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-347 · Improper Verification of Cryptographic Signature

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.10%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Check TLS negotiations and unexpected certificates in the component’s traffic.

endpoint telemetry (EDR)network IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Affected products added · zoom communications inc./zoom workplace vdi client
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 7.8
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
2025
CVE published
Nov 13, 2025 · Zoom

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

www.zoom.com/en/trust/security-bulletin/ZSB-25042
Vendor Advisory, NIST National Vulnerability Database

Elsewhere on this site

Zoom
every CVE for this vendor

Cryptography
same class

CWE-347
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-53411 Improper Input Validation in Zoom Workplace Virtual Desktop Infrastructure Jul 16, 2026
Critical CVE-2026-53412 Improper Input Validation in Zoom Workplace Desktop Jul 16, 2026
High CVE-2026-53410 TOCTOU Race Condition in Zoom Remote Control For Zoom Contact Center Jul 16, 2026
High CVE-2026-30905 External Control of File Name or Path in the Zoom Workplace VDI Plugin Windows Universal… May 13, 2026
High CVE-2026-30902 Zoom Clients for Windows - Improper Privilege Management Mar 11, 2026
Critical CVE-2026-30903 External Control of File Name or Path in the Mail feature of Zoom Workplace for Windows… Mar 11, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-64740 is "Zoom Workplace VDI Client for Windows - Improper Verification of Cryptographic Signature", rated High. It affects Workplace Virtual Desktop Infrastructure (Zoom); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.8 describes technical severity. EPSS 0.10% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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