SAP NetWeaver - SSRF (CVE-2021-33690)
222Exploiting IPs reported
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 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.
According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2021-33690 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. CrowdSec data also reveals a clear uptick in attacks involving CVE-2021-33690 over the past week. Activity is above the usual baseline, suggesting growing attention from attackers. This may reflect rising awareness, recent exploit releases, or expanded targeting efforts.
Observed exploitation attempts typically involve requests to URLs containing /tc.cbs.appl/tcspseudo.
Exploitation
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Common Weakness Enumeration (CWE)
Protection
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Blocklist
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