Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated remote attacker make ArcGIS Server Manager send web requests on their behalf. That can expose internal network information and support follow-on attacks. Public sources rate it critical because no login or user interaction is required and confidentiality and integrity impact are high.
Executive priority
Treat this as urgent for exposed ArcGIS Server Manager deployments. It is critical severity and unauthenticated, but the supplied evidence does not confirm active exploitation. Prioritize patch verification and access restriction for internet-facing or sensitive-network instances.
Technical view
CVE-2021-29102 is CWE-918 SSRF in Esri ArcGIS Server Manager 10.8.1 and below. The issue can forge GET requests to arbitrary URLs from the server. CVSS 3.0 is 9.1, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Likely exposure
Organizations running ArcGIS Server Manager 10.8.1 or earlier are the stated exposure group. Risk is higher when Manager is reachable from the internet or less-trusted networks. The bundle does not identify specific deployment configurations beyond the affected version statement.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. The risk comes from remote unauthenticated reachability and SSRF impact, including potential internal network enumeration or facilitation of other attacks.
Researcher notes
Source detail is limited to the CVE record and Esri patch reference. Avoid assuming exploit availability, affected subcomponents beyond Server Manager, or exact fixed versions without vendor confirmation. Focus validation on version, reachability, and server-side egress behavior.
Mitigation direction
- Identify ArcGIS Server Manager instances at version 10.8.1 or below.
- Review Esri’s ArcGIS Server Security 2021 Update 1 Patch guidance.
- Apply Esri-supported security updates or patches where applicable.
- Restrict access to Server Manager from untrusted networks.
- Monitor server egress for unusual internal or external HTTP requests.
Validation and detection
- Inventory ArcGIS Server and Server Manager versions across environments.
- Confirm whether Server Manager is reachable from the internet or partner networks.
- Verify patch status against Esri’s published security update guidance.
- Review logs for unexpected outbound GET requests from ArcGIS servers.
- Document compensating network controls for any unpatched instance.
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-918: 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 lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-29102 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
- Critical
- CVSS
- 9.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:N/S:U/C:H/I:H/A:N3.95.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.1CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.