Threats / SAP / CVE-2025-42999
CVE-2025-42999
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-09-19
SAP NetWeaver vulnerability
SAP NetWeaver Visual Composer Metadata Uploader contains a deserialization vulnerability (CWE-502) allowing privileged attackers to execute arbitrary code and compromise system confidentiality, integrity, and availability.
Verdict
Today item, not a backlog item.
A privileged attacker can exploit unsafe deserialization in the Metadata Uploader component to deserialize malicious objects, achieving remote code execution and full system compromise. Active exploitation in the wild increases risk.
CISA KEV Yes · 2025-05-155Ransomware use Flagged5EPSS 0.13868 (verify live)6CVSS 9.13CISA SSVC Exploitation: active · Automatable: no · Impact: total4
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
10 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-05-15), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.13868 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 9.1 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H) · Affected: SAP, NetWeaver. Confirm exact fixed builds in the vendor advisory.CVSS — CNA-assigned (CVE.org), version 3.1, set at disclosure.
Weakness (CWE)
Mapped to CWE-502 Deserialization of Untrusted Data — weakness family: Injection.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 2 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious serialized object designed to execute arbitrary code upon deserialization.
Business
An insider or compromised account with upload privileges becomes a vector for arbitrary code execution within the NetWeaver environment.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I upload the malicious serialized payload through the Visual Composer Metadata Uploader interface.
Business
The application processes the untrusted input without validation, triggering instantiation of the malicious object.
3
Lateral reach — past segmentation narrative 3
Attacker
I gain code execution on the host system with the privileges of the NetWeaver process.
Business
Attackers can read sensitive data, modify business-critical configurations, or pivot to other systems on the network.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by sapCNA
Credited with finding itNo finder is named in the public CVE record or the scanned vendor advisory — attribution scoped to the sources checked.
Found an error? Propose a correction.
A correction is a cited counter-claim — it must cite a source,
gets reviewed by a second human, and is never auto-applied. See the
correction convention and our identity
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