CVEs / CVE-2021-21973
CVE-2021-21973: VMware vCenter Server and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability
- Known exploited in the CISA KEV catalog since 7 Mar 2022
- medium 5.3 CVSS 3.1 (NVD)
- EPSS 88% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
VMware vCenter Server and Cloud Foundation Server contain a SSRF vulnerability due to improper validation of URLs in a vCenter Server plugin. This allows for information disclosure.
Description
The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue by sending a POST request to vCenter Server plugin leading to information disclosure. This affects: VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| n/a VMware vCenter Server | 7.x before 7.0 U1c | — |
| n/a VMware vCenter Server | 6.7 before 6.7 U3l | — |
| n/a VMware vCenter Server | 6.5 before 6.5 U3n | — |
| n/a VMware Cloud Foundation | 4.x before 4.2 | — |
| n/a VMware Cloud Foundation | 3.x before 3.10.1.2 | — |
Exploitation
| In CISA KEV since | 7 Mar 2022 |
|---|---|
| Due date for US federal agencies | 21 Mar 2022 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 3.1 | 5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NScored by NVD |
|---|---|
| Weakness | CWE-918 |
References
- CVE-2021-21973 on NVD
- CVE-2021-21973 in the CISA KEV catalog
- https://www.vmware.com/security/advisories/VMSA-2021-0002.html Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21973 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.