# CVE-2021-33690: SAP NetWeaver - SSRF

> Live exploitation tracking for CVE-2021-33690 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2021-33690

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 9.9
- **Public exploit available:** Yes
- **Affected products:** SAP NetWeaver Development Infrastructure (Component Build Service)
- **Weaknesses:** CWE-918 (Server-Side Request Forgery (SSRF))
- **Tags:** enterprise_software

## Description

Server-Side Request Forgery (SSRF) vulnerability has been detected in the SAP NetWeaver Development Infrastructure Component Build Service versions - 7.11, 7.20, 7.30, 7.31, 7.40, 7.50The SAP NetWeaver Development Infrastructure Component Build Service allows a threat actor who has access to the server to perform proxy attacks on server by sending crafted queries. Due to this, the threat actor could completely compromise sensitive data residing on the Server and impact its availability.Note: The impact of this vulnerability depends on whether SAP NetWeaver Development Infrastructure (NWDI) runs on the intranet or internet. The CVSS score reflects the impact considering the worst-case scenario that it runs on the internet.

## CrowdSec analysis

[CVE-2021-33690](https://euvd.enisa.europa.eu/vulnerability/CVE-2021-33690) is a Server-Side Request Forgery (SSRF) vulnerability affecting SAP NetWeaver Development Infrastructure. By abusing specific application endpoints, attackers can leverage the server to perform proxy-based attacks that may ultimately lead to the compromise of sensitive data and impact system availability.

CrowdSec has been tracking this vulnerability and its exploits since 27th of May 2025.

CrowdSec network observations suggest that most exploitation of CVE-2021-33690 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental.
CrowdSec network telemetry also shows that exploitation of CVE-2021-33690 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Observed exploitation attempts typically involve requests to URLs containing `/tc.cbs.appl/tcspseudo`.

## Timeline

- 2021-09-15: CVE Published. CVE-2021-33690 is published to NVD.
- 2025-05-27: Rule Released. CrowdSec releases a rule to detect CVE-2021-33690 exploitation attempts against the CrowdSec Network.
- 2025-05-28: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2021-33690 for the first time.

## References

- https://launchpad.support.sap.com/#/notes/3072955
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-33690.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2021-33690) follows observed exploitation activity for CVE-2021-33690. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.