SAP has launched patches to deal with a second vulnerability exploited in current assaults concentrating on SAP NetWeaver servers as a zero-day.
The corporate issued security updates for this security flaw (CVE-2025-42999) on Monday, Could 12, saying it was found whereas investigating zero-day assaults involving one other unauthenticated file add flaw (tracked as CVE-2025-31324) in SAP NetWeaver Visible Composer that was mounted in April.
“SAP is conscious of and has been addressing vulnerabilities in SAP NETWEAVER Visible Composer,” a SAP spokesperson informed BleepingComputer. “We ask all prospects utilizing SAP NETWEAVER to put in these patches to guard themselves. The Safety Notes could be discovered right here: 3594142 & 3604119.”
ReliaQuest first detected the assaults exploiting CVE-2025-31324 as a zero-day in April, reporting that menace actors had been importing JSP net shells to public directories and the Brute Ratel crimson crew device after breaching prospects’ methods by unauthorized file uploads on SAP NetWeaver. The hacked cases had been absolutely patched, indicating the attackers used a zero-day exploit.
This malicious exercise was additionally confirmed by cybersecurity corporations watchTowr and Onapsis, who additionally noticed the attackers importing net shell backdoors on unpatched cases uncovered on-line. Forescout’s Vedere Labs has linked a few of these assaults to a Chinese language menace actor it tracks as Chaya_004.
Onyphe CTO Patrice Auffret informed BleepingComputer in late April that “One thing like 20 Fortune 500/World 500 corporations are susceptible, and plenty of of them are compromised,” including that there have been 1,284 susceptible cases uncovered on-line on the time, 474 already compromised.
The Shadowserver Basis is now monitoring over 2040 SAP Netweaver servers uncovered on the Web and susceptible to assaults.
New flaw additionally exploited in zero-day assaults
Whereas SAP didn’t affirm that CVE-2025-42999 was exploited within the wild, Onapsis CTO Juan Pablo Perez-Etchegoyen informed BleepingComputer that the menace actors had been chaining each vulnerabilities in assaults since January.
“The assaults we noticed throughout March 2025 (that began with primary proves again in January 2025) are literally abusing each, the dearth of authentication (CVE-2025-31324) in addition to the insecure de-serialization (CVE-2025-42999),” Perez-Etchegoyen informed BleepingComputer.
“This mix allowed attackers to execute arbitrary instructions remotely and with none sort of privileges on the system. This residual threat is principally a de-serialization vulnerability solely exploitable by customers with VisualComposerUser position on the SAP goal system.”
SAP admins are suggested to instantly patch their NetWeaver cases and contemplate disabling the Visible Composer service if potential, in addition to prohibit entry to metadata uploader providers and monitor for suspicious exercise on their servers.
Because the assaults began, CISA has added the CVE-2025-31324 flaw to its Identified Exploited Vulnerabilities Catalog, ordering federal companies to safe their methods by Could 20, as mandated by Binding Operational Directive (BOD) 22-01.
“All these vulnerabilities are frequent assault vectors for malicious cyber actors and pose vital dangers to the federal enterprise,” CISA warned.
Based mostly on an evaluation of 14M malicious actions, uncover the highest 10 MITRE ATT&CK strategies behind 93% of assaults and tips on how to defend towards them.
