Security readout for executives and security teams
Plain-English summary
ArcGIS Server Manager 10.8.1 and below has a stored cross-site scripting flaw. An unauthenticated remote attacker may store malicious text that later runs in another user's browser. Business impact is mainly session or data exposure and unauthorized actions in the web application, not direct system takeover.
Executive priority
Treat as a moderate priority maintenance and exposure-reduction issue. Patch affected ArcGIS Server deployments, especially if Manager is internet-accessible or used by privileged administrators. No provided source supports emergency active-exploitation handling.
Technical view
CVE-2021-29107 is CWE-79 stored XSS in Esri ArcGIS Server Manager. CVSS 3.0 is 6.1: network reachable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Organizations running Esri ArcGIS Server Manager 10.8.1 or below may be exposed. The source bundle specifically lists ArcGIS Server 10.6.1, but the title and description state 10.8.1 and below, so validate installed versions against Esri guidance.
Exploitation context
The provided sources do not show active exploitation and KEV is false. Exploitation requires a victim to view stored attacker-controlled content in ArcGIS Server Manager, so risk rises when Manager is reachable by untrusted users or administrators browse submitted content.
Researcher notes
The record is sparse and has a version-detail inconsistency: affected data lists ArcGIS Server 10.6.1, while the description says Manager 10.8.1 and below. Use Esri's advisory as the authoritative remediation reference and avoid assuming exploit maturity.
Mitigation direction
- Apply Esri's ArcGIS Server Security 2021 Update 1 Patch where applicable.
- Check Esri guidance for the exact supported upgrade or patch path.
- Limit ArcGIS Server Manager access to trusted administrative networks.
- Review web application input handling and output encoding controls.
Validation and detection
- Inventory ArcGIS Server and Manager versions across environments.
- Confirm whether any instance is version 10.8.1 or below.
- Verify the Esri security patch is installed on affected systems.
- Check vulnerability scanners for CVE-2021-29107 findings.
- Review logs for suspicious stored content submissions or administrator browser alerts.
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-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-2021-29107 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
- 6.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/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:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.1MediumVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.esri.com/arcgis-blog/products/arcgis-enterprise/administration/arcgis-server-security-2021-update-1-patch/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.