CVE-2021-36095Network attack vector

Unauthenticated user enumeration via lost-password feature

Published Sep 6, 2021 · Updated Sep 16, 2024

User enumeration in OTRS 7.0.28 and earlier and Community Edition 6.0.1 and later allows remote attackers to identify valid logins. The lost-password feature reveals whether a submitted login is valid, but OTRS has not published the responsible code path or response behavior. No authentication or user interaction is required, and the reported impact is limited to disclosure of valid account names.

CVSS severity5.3
Medium
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

User enumeration in OTRS 7.0.28 and earlier and Community Edition 6.0.1 and later allows remote attackers to identify valid logins. The lost-password feature reveals whether a submitted login is valid, but OTRS has not published the responsible code path or response behavior. No authentication or user interaction is required, and the reported impact is limited to disclosure of valid account names.

The record

CVE
CVE-2021-36095
Published
Sep 6, 2021
Updated
Sep 16, 2024
Vendor
OTRS AG
Product
OTRS
Classifications
CWE-200, CWE-640
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=7.0.x <=7.0.28

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OTRS AG · OTRSversion=7.0.x <=7.0.28
OTRS AG · ((OTRS)) Community Editionversion=6.0.1 <unspecified

Published CVSS scores

5.3OTRS AGCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-640Weak Password Recovery Mechanism for Forgotten Password

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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