CVE-2026-27671Patch

MEDIUMCVSS 9.8 · CRITICAL

Exploitation observed; activity peaked at 10 mentions and remains active

Immediate actions

Patch affected systems immediately
Assume compromise if assets are exposed
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: Immediate (within 24h)

NVD description

Due to improper RFC protocol validation in the SAP Kernel used by the Application Server ABAP of SAP NetWeaver and ABAP Platform, an unauthenticated attacker can send a crafted RFC request that exploits logical errors in memory management, leading to memory corruption. This could lead to a high impact on the confidentiality, integrity, and availability of the application.

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5.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-121

Priority

MEDIUM

Exploitation

ACTIVE

PoC

YES

Patch

AVAILABLE

Momentum

DECLINING

Threat summary

Active exploitation appears in 1 classified signals
Public PoC is present in monitored signal
Patch or workaround signal is available
15 mentions across 5 observed days

What's happening

Active exploitation reported across 1 signal
PoC mentioned or linked in 1 signal
Patch or workaround mentioned in 11 signals
Technical details provided in 12 signals
Disclosure: 3 classified signals
General: 2 classified signals
Peaked 4d ago at 10 mentions (2026-06-09); latest day: 1
15 total mentions across 5 days

Deep dive

Activity timeline15 mentions / 5d

Signal classification4 categories

Patch

960.0%

Disclosure

320.0%

General

213.3%

Active Exploitation

16.7%

Referenced assets12 URLs

By indicator

Classification over time

Date	Total	Labels

2026-06-09	10	Disclosure2General1Patch7
2026-06-10	2	Active Exploitation1Patch1
2026-06-11	1	Patch1
2026-07-01	1	General1
2026-07-07	1	Disclosure1

Full discourse15 posts

Cybersecurity News Everyday@TweetThreatNews136d
Patch
SAP's June 2026 patch fixes 15 flaws, including 4 critical issues in NetWeaver and Commerce Cloud. CVE-2026-44748 and CVE-2026-27671 may enable auth bypass, memory corruption, and directory traversal. #SAP #NetWeaver #CommerceCloud https://ift.tt/SjWas2O
Post summary
SAP announced a June 2026 patch that fixes 15 flaws, including critical issues in NetWeaver and Commerce Cloud that could enable authentication bypass, memory corruption, and directory traversal.
00011135
4.4K followersView on X
CCB Alert@CCBalert136d
Patch
Warning: #SAP has released security updates for 15 vulnerabilities in several of their products, including 4 critical vulnerabilities: #CVE-2026-44748; #CVE-2026-27671; #CVE-2026-40128 and #CVE-2026-22732. Read our advisory here: https://ccb.belgium.be/advisories/warning-sap-addresses-critical-vulnerabilities-affecting-multiple-sap-products-patch #Patch #Patch #Patch
Post summary
SAP has issued patches for 15 vulnerabilities, targeting four critical CVEs, and provides an advisory link for updates.
02000141
7.2K followersView on X
Jacek Bugajski@DzejBi_JB108d
Disclosure
4/ Napastnik potrzebuje otwartych drzwi. SAP je dostarczył. Ostatni cykl not: - CVE-2026-44748 (9.9): obejście SAML w NetWeaver ABAP - CVE-2026-27671 (9.8): memory corruption w RFC, BEZ workaroundu Plus supply-chain z maja: złośliwe pakiety npm w CAP na BTP (CVE-2026-46421)
Post summary
The post announces three high‑severity (CVSS 9.8–9.9) SAP vulnerabilities – a SAML bypass in NetWeaver ABAP, a memory‑corruption flaw in RFC, and malicious npm packages in CAP on BTP – and notes that no workarounds are currently available.
1000077
338 followersView on X
CyberAlertsHQ@CyberAlertsHQ136d
Disclosure
🚨 NEW: SAP June Patch Day — 4 critical flaws, top CVSS 9.9. The worst: CVE-2026-44748 lets a low-privileged user forge SAML assertions and bypass authentication entirely on NetWeaver ABAP. CVE-2026-27671 (CVSS 9.8) is unauthenticated memory corruption via crafted RFC requests — potential RCE with no workaround, kernel update required. Also critical: CVE-2026-40128 (CVSS 9.0) unauthenticated directory traversal on NetWeaver Java, and CVE-2026-22732 (CVSS 9.1) unauthenticated Spring Security bypass in Commerce Cloud. SAP runs the back-end of most of the world's largest enterprises. No in-the-wild exploitation confirmed yet — patch now before that changes. Full breakdown 👇 https://www.bleepingcomputer.com/news/security/sap-fixes-critical-flaws-in-netweaver-and-commerce-cloud/
Post summary
SAP announced critical patches for several high‑CVSS vulnerabilities, highlighting no confirmed wild exploitation yet and urging immediate patching.
1000084
77 followersView on X
Orizon@OrizonCyber136d
Patch
🚨 CVE-2026-27671 — CVSS 9.8/10 ██████████ Due to improper RFC protocol validation in the SAP Kernel used by the Application Server ABAP of SAP NetWeaver and ABAP... Severity: CRITICAL Patch now. #cybersecurity #CVE https://t.co/ZZ2W8zEIHi
Post summary
CVE-2026-27671 is a critical SAP NetWeaver kernel vulnerability (CVSS 9.8) caused by improper RFC protocol validation, and a vendor patch is now available.
10000114
59 followersView on X
IntegSec@integ_sec114d
General
CVE-2026-27671: SAP NetWeaver Memory Corruption Vulnerability - What It Means for Your Business and How to Respond https://hubs.li/Q04ncGWY0
Post summary
The post merely announces the CVE with a headline and a link, without providing technical details, PoC, exploit, or mitigation information.
0000031
31 followersView on X
Daily Security Review@securitydailyr134d
Patch
SAP June Patch Day: 15 security notes, 4 critical. CVE-2026-44748 (CVSS 9.9) — XML Signature Wrapping bypass in NetWeaver SAML. CVE-2026-27671 (CVSS 9.8) — unauthenticated memory corruption in ABAP RFC gateway. https://dailysecurityreview.com/resources/sap-patches-cvss-9-9-saml-flaw-and-abap-memory-corruption/ #CyberSecurity #Vulne https://t.co/vngyJitU2z
Post summary
The tweet announces SAP’s June Patch Day, highlighting 15 security fixes including two critical CVEs—CVE‑2026‑44748 (XML Signature Wrapping bypass) and CVE‑2026‑27671 (unauthenticated memory corruption)—and links to further details.
0000047
118 followersView on X
SecAlerts@SecAlertsCo135d
Patch
SAP NetWeaver ABAP hit with a critical 9.8 memory corruption flaw. CVE-2026-27671 lets unauthenticated attackers send crafted RFC requests to exploit the SAP Kernel. No auth needed. Patch via SAP Note 3717897 now. #SAP #NetWeaver https://secalerts.co/vulnerability/CVE-2026-27671 https://t.co/Lj9ereR0f9
Post summary
SAP NetWeaver ABAP suffers from a critical (CVSS 9.8) memory corruption flaw (CVE-2026-27671) that allows unauthenticated RFC exploitation, and a patch is available via SAP Note 3717897.
0000069
832 followersView on X
Aviatrix Threat Research Center@aviatrixtrc136d
Active Exploitation
TRC analysis shows attackers exploiting CVE-2026-27671 can achieve unauthenticated access to SAP NetWeaver systems, then escalate privileges through missing authorization checks to gain administrative control. Runtime segmentation helps contain post-compromise lateral movement across enterprise SAP environments. #ZeroTrust 🔗 Full breakdown: https://aviatrix.ai/threat-research-center/sap-netweaver-commerce-cloud-vulnerabilities-june-2026
Post summary
The post reports that attackers are actively exploiting CVE-2026-27671 to gain unauthenticated access and elevate privileges in SAP NetWeaver systems, with runtime segmentation used to limit lateral movement.
0000048
1.9K followersView on X
CyberAlertsHQ@CyberAlertsHQ136d
Patch
🚨 UPDATE — CVE-2026-44748 SAP NetWeaver: No in-the-wild exploitation yet — no public PoC either. But the patch footprint is massive: SAP_BASIS versions 702 through 919 are all affected, spanning 20+ years of deployments. Most enterprise SAP environments will need multiple systems patched. Key interim step confirmed by Onapsis: disabling SAML authentication neutralizes CVE-2026-44748, but doesn't cover all signed XML use cases. No workaround exists for CVE-2026-27671 — kernel update required. Prior SAP NetWeaver critical flaws were weaponized within days. Clock is ticking. 👇 https://www.bleepingcomputer.com/news/security/sap-fixes-critical-flaws-in-netweaver-and-commerce-cloud/
Post summary
CVE-2026-44748 in SAP NetWeaver isn’t currently exploited in the wild, but it affects a wide range of legacy versions; disabling SAML authentication mitigates the flaw while a patch or kernel update addresses the vulnerability.
00000207
77 followersView on X
Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters136d
Disclosure
CVE-2026-27671 - Critical memory corruption in #SAP NetWeaver/ABAP Platform via crafted RFC request. Unauthenticated RCE risk. CVSS 9.8. No patch yet. Isolate affected systems immediately. #CVE #SAP #InfoSec #CyberCommunity #DevSecOps Detailed info with all rules https://www.valtersit.com/cve/CVE-2026-27671
Post summary
The post announces a critical memory corruption vulnerability in SAP NetWeaver/ABAP Platform, provides technical details and a high CVSS score, notes no patch is available yet, and recommends isolating affected systems.
0000063
920 followersView on X
ThreatCluster@threatcluster136d
Patch
SAP released 15 security notes addressing four critical flaws including CVE-2026-44748 and CVE-2026-27671 in NetWeaver and other core products, Belgium's Centre for Cybersecurity said. https://threatcluster.io/cluster/sap-issues-urgent-patches-for-critical-vulnerabilities-in-co-edb02464
Post summary
SAP has issued urgent security patches in 15 notes for four critical flaws, including CVE‑2026‑44748 and CVE‑2026‑27671.
0000049
318 followersView on X
ThreatAft@ThreatAft136d
Patch
🔐 CVE-2026-27671: Critical unauthenticated memory corruption in SAP ABAP kernel (CVSS 9.8). Crafted RFC requests → stack buffer overflow → potential RCE. Affects kernel versions 7.22–9.19.Patch via SAP Note 3717897. 🔗 https://threataft.com/articles/cve-2026-27671-sap-abap-kernel-memory-corruption #CyberSecurity #SAP #CVE202627671
Post summary
The post discloses a critical memory corruption flaw (CVE‑2026‑27671) in SAP ABAP kernel, details the exploit path, and announces a patch via SAP Note 3717897.
0000054
29 followersView on X
Upwind Security MDR@UpwindMDR136d
Patch
🚨 Critical - SAP NetWeaver / ABAP Platform Memory Corruption (CVE-2026-27671) A critical vulnerability in the SAP Kernel allows unauthenticated attackers to send crafted RFC requests that trigger memory corruption through improper RFC protocol validation. Impact: • unauthenticated network exploitation • memory corruption • potential system compromise • high impact to confidentiality, integrity, and availability Affected products: • SAP NetWeaver Application Server ABAP • SAP ABAP Platform 👉 Apply SAP Security Note 3717897 and review SAP Security Patch Day updates immediately.
Post summary
CVE-2026-27671 is a critical memory corruption flaw in SAP NetWeaver that allows unauthenticated RFC requests to compromise systems; SAP recommends applying Security Note 3717897 and related Patch Day updates immediately.
0000082
210 followersView on X
Vulmon Vulnerability Feed@VulmonFeeds136d
General
CVE-2026-27671 Memory Corruption via RFC Protocol Validation in SAP NetWeaver AB... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-27671 Customizable Vulnerability Alerts: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=4
Post summary
The post announces CVE‑2026‑27671, noting a memory‑corruption flaw in SAP NetWeaver’s RFC protocol validation, but provides no PoC, exploit details, active usage, or patch information.
0000064
4.0K followersView on X

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What researchers are saying

CVE-2026-27671

Cybersecurity News Everyday[verified]@TweetThreatNewsPatch

SAP announced a June 2026 patch that fixes 15 flaws, including critical issues in NetWeaver and Commerce Cloud that could enable authentication bypass, memory corruption, and directory traversal.

Jacek Bugajski[verified]@DzejBi_JBDisclosure

The post announces three high‑severity (CVSS 9.8–9.9) SAP vulnerabilities – a SAML bypass in NetWeaver ABAP, a memory‑corruption flaw in RFC, and malicious npm packages in CAP on BTP – and notes that no workarounds are currently available.

CyberAlertsHQ[verified]@CyberAlertsHQDisclosure

SAP announced critical patches for several high‑CVSS vulnerabilities, highlighting no confirmed wild exploitation yet and urging immediate patching.

Orizon[verified]@OrizonCyberPatch

CVE-2026-27671 is a critical SAP NetWeaver kernel vulnerability (CVSS 9.8) caused by improper RFC protocol validation, and a vendor patch is now available.

IntegSec[verified]@integ_secGeneral

The post merely announces the CVE with a headline and a link, without providing technical details, PoC, exploit, or mitigation information.

Aviatrix Threat Research Center[verified]@aviatrixtrcActive Exploitation

The post reports that attackers are actively exploiting CVE-2026-27671 to gain unauthenticated access and elevate privileges in SAP NetWeaver systems, with runtime segmentation used to limit lateral movement.

CyberAlertsHQ[verified]@CyberAlertsHQPatch

CVE-2026-44748 in SAP NetWeaver isn’t currently exploited in the wild, but it affects a wide range of legacy versions; disabling SAML authentication mitigates the flaw while a patch or kernel update addresses the vulnerability.

Hugo | DevOps | Cybersecurity 🇱🇻[verified]@HugoValtersDisclosure

The post announces a critical memory corruption vulnerability in SAP NetWeaver/ABAP Platform, provides technical details and a high CVSS score, notes no patch is available yet, and recommends isolating affected systems.