What is CVE-2021-42955?

CVE-2021-42955 is a high-severity vulnerability in Microsoft Windows, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.3/10. Published 2021-11-17.

How severe is CVE-2021-42955?

High severity. CVSS v3 base score is 7.3 out of 10.

Is CVE-2021-42955 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Microsoft Windows

CVE-2021-42955

Zoho Remote Access Plus Server Windows Desktop binary fixed in version 10.1.2132 is affected by an unauthorized password reset vulnerability. Because of the designed password reset mechanism, any non-admin Windows user can reset the password of the Remote Access Plus Server Admin account.

Published 2021-11-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L.

EPSS exploit prediction

EPSS: 0.004 (34.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

medium.com/nestedif/vulnerability-disclosure-improper-acl-unauthorized-password… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-42955?: CVE-2021-42955 is a high-severity vulnerability in Microsoft Windows, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.3/10. Published 2021-11-17.
How severe is CVE-2021-42955?: High severity. CVSS v3 base score is 7.3 out of 10.
Is CVE-2021-42955 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.