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Exploited vulnerability · CISA KEV

Is CVE-2025-42999 exploited? Yes: in CISA KEV since 15 May 2025

Gociux · SAP NetWeaver · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-42999, SAP NetWeaver Deserialization Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 15 May 2025, 2 days after it was published. It is known to be used in ransomware campaigns. It affects SAP NetWeaver. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 15 May 2025
ransomwareKnownused in campaigns
EPSStop 5%very likely to be exploited
severity9.1CVSS 3.1 · critical
US federal due5 Jun 2025BOD 22-01 deadline

What it is

SAP NetWeaver Visual Composer Metadata Uploader contains a deserialization vulnerability that allows a privileged attacker to compromise the confidentiality, integrity, and availability of the host system by deserializing untrusted or malicious content.

VendorSAP (14 exploited CVEs in KEV)
ProductNetWeaver
VulnerabilitySAP NetWeaver Deserialization Vulnerability
WeaknessCWE-502
Published13 May 2025
Added to KEV15 May 2025
Reported by (CNA)sap

What to do

  1. Check whether you run it. Look for NetWeaver in your asset inventory, including appliances and cloud images. Stack check lists every exploited SAP CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 13 May 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for SAP.

Other exploited CVEs in NetWeaver

References

Questions

Is CVE-2025-42999 being exploited?

Yes. CISA added CVE-2025-42999 to the Known Exploited Vulnerabilities catalog on 15 May 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-42999 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2025-42999?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check SAP's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected NetWeaver and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2025 · SAP scorecard · act-now radar.

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