Security readout for executives and security teams
Plain-English summary
This CVE lets an unauthenticated person determine whether specific OTRS usernames are valid through the lost password feature. It does not grant direct access, but it lowers the cost of targeted phishing, password guessing, and account-focused attacks against helpdesk users.
Executive priority
Handle as a moderate-priority exposure reduction item. It is not a direct compromise vulnerability, but it can support account attacks against a sensitive helpdesk platform and should be closed during normal security patch cycles.
Technical view
CVE-2021-36095 is a CWE-200 information exposure issue in OTRS password recovery behavior. A network attacker with no privileges or user interaction can infer valid logins. CVSS 3.1 is 5.3, reflecting low-confidentiality impact only, with no integrity or availability impact stated.
Likely exposure
Exposure is most likely where affected OTRS or ((OTRS)) Community Edition instances expose the lost password feature to the internet or broad internal networks. The bundle identifies ((OTRS)) Community Edition 6.0.1 and later, and OTRS 7.0.x through 7.0.28.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. The issue is still practical for reconnaissance because it is unauthenticated, network-reachable, and tied to a common public helpdesk workflow.
Researcher notes
Evidence is limited to the CVE record and OTRS advisory reference in the bundle. Do not claim exploitation or specific fixed releases unless verified in the vendor advisory. Focus assessment on exposed password recovery behavior and affected version confirmation.
Mitigation direction
- Review OTRS advisory 2021-18 for vendor-confirmed fixed versions and upgrade guidance.
- Inventory exposed OTRS instances and confirm whether the lost password feature is enabled.
- Restrict password recovery access where business operations allow it.
- Monitor for unusual password recovery activity or repeated account discovery patterns.
- Strengthen MFA and phishing-resistant controls for helpdesk and administrative accounts.
Validation and detection
- Identify deployed OTRS product line and exact version for every instance.
- Confirm whether any instance matches the affected version ranges in the CVE record.
- Review external exposure of login and lost password pages.
- Check application and web logs for abnormal password reset request volume.
- Verify remediation against the vendor advisory, not assumptions about version numbering.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-36095 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://otrs.com/release-notes/otrs-security-advisory-2021-18/CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.