CVE-2021-45031Network attack vector

Unauthenticated privileged account access via password generation

Published Mar 30, 2022 · Updated May 18, 2026

Authentication bypass in Mepsan USC+ before 3.0 allows remote attackers to generate passwords for highly privileged accounts. The published record identifies the login function as the affected locus but does not disclose how it generates or exposes those passwords from untrusted input. No prior authentication or user interaction is required; possession of a generated privileged password enables account access, while further consequences remain undisclosed.

CVSS severity7.7
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Mepsan USC+ before 3.0 allows remote attackers to generate passwords for highly privileged accounts. The published record identifies the login function as the affected locus but does not disclose how it generates or exposes those passwords from untrusted input. No prior authentication or user interaction is required; possession of a generated privileged password enables account access, while further consequences remain undisclosed.

The record

CVE
CVE-2021-45031
Published
Mar 30, 2022
Updated
May 18, 2026
Vendor
Mepsan
Product
USC+
Classifications
CWE-305, CAPEC-115, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2022CVE publishedPublication date reported by the CVE source.
  2. May 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mepsan · USC+version=unspecified <3.0

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
7.7Computer Emergency Response Team of the Republic of TurkeyCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-305Authentication Bypass by Primary Weakness
CAPEC-115Authentication Bypass
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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