Security readout for executives and security teams
Plain-English summary
This is a low-severity cross-site scripting issue in the OTRS Survey module. A survey administrator could create a survey that causes script execution in another agent's interface when that agent tries to modify the survey.
Executive priority
Treat as routine remediation unless the affected Survey module is exposed to many privileged agents or administrative trust boundaries are weak.
Technical view
CVE-2021-21434 is CWE-79 affecting OTRS AG Survey 6.0.x through 6.0.20 and 7.0.x through 7.0.19. CVSS 3.1 is 3.5 with network access, low complexity, high privileges required, and user interaction required.
Likely exposure
Exposure is limited to organizations running the affected OTRS AG Survey module versions, especially where multiple agents can administer or edit surveys.
Exploitation context
The source bundle does not show active exploitation, and KEV is false. Abuse requires survey administrator privileges and another agent interacting with the crafted survey in the agent interface.
Researcher notes
The advisory describes stored XSS from survey content into the agent interface. Evidence provided does not include exploit maturity, patch details, or broader product impact beyond OTRS AG Survey.
Mitigation direction
- Check OTRS Security Advisory 2021-01 for the vendor-supported update path.
- Upgrade OTRS AG Survey beyond the affected version ranges where vendor guidance confirms availability.
- Restrict survey administrator privileges to trusted users until remediation is complete.
- Review existing surveys for unexpected embedded active content.
Validation and detection
- Inventory OTRS Survey deployments and record exact module versions.
- Confirm whether versions are 6.0.20 or earlier, or 7.0.19 or earlier.
- Review who has survey administrator privileges in affected deployments.
- After remediation, verify the installed version is outside the affected ranges.
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
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ATT&CK lookup starting points
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CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupCVE-2021-21434 mapping review
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Open ATT&CK lookup- Severity
- Low
- CVSS
- 3.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/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:H/UI:R/S:U/C:L/I:L/A:N0.92.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.5LowVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://otrs.com/release-notes/otrs-security-advisory-2021-01/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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.