How severe is CVE-2021-27610?

CVE-2021-27610 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-27610 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27610?

CVE-2021-27610 primarily affects Sap Netweaver Abap. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27610?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-27610 published?

CVE-2021-27610 was published on 2021-06-16 and last updated on 2026-06-17.

CVE-2021-27610

CVE-2021-27610 is a critical-severity vulnerability in Sap Netweaver Abap with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Sap Netweaver Abap
Published: 2021-06-16
Last modified: 2026-06-17

Description

SAP NetWeaver ABAP Server and ABAP Platform, versions - 700, 701, 702, 731, 740, 750, 751, 752, 753, 754, 755, 804, does not create information about internal and external RFC user in consistent and distinguished format, which could lead to improper authentication and may be exploited by malicious users to obtain illegitimate access to the system.

Frequently asked questions

What is CVE-2021-27610?: SAP NetWeaver ABAP Server and ABAP Platform, versions - 700, 701, 702, 731, 740, 750, 751, 752, 753, 754, 755, 804, does not create information about internal and external RFC user in consistent and distinguished format, which could lead to improper authentication and may be exploited by malicious users to obtain illegitimate access to the system.
How severe is CVE-2021-27610?: CVE-2021-27610 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-27610 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27610?: CVE-2021-27610 primarily affects Sap Netweaver Abap. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27610?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-27610 published?: CVE-2021-27610 was published on 2021-06-16 and last updated on 2026-06-17.

References

Affected products (24)

cpe:2.3:a:sap:netweaver_abap:700:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:701:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:702:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:731:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:740:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:750:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:751:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:752:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:753:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:754:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:755:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_abap:804:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:700:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:701:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:702:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:731:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:740:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:750:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:751:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:752:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:753:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:754:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:755:*:*:*:*:*:*:*
cpe:2.3:a:sap:netweaver_application_server_abap:804:*:*:*:*:*:*:*

More vulnerabilities in Sap Netweaver Abap

CVE-2012-4341 — Critical (CVSS 10.0): Multiple stack-based buffer overflows in msg_server.exe in SAP NetWeaver ABAP 7.x allow remote attackers to cause a…
CVE-2021-38178 — High (CVSS 8.8): The software logistics system of SAP NetWeaver AS ABAP and ABAP Platform versions - 700, 701, 702, 710, 730, 731, 740,…
CVE-2022-22543 — High (CVSS 7.5): SAP NetWeaver Application Server for ABAP (Kernel) and ABAP Platform (Kernel) - versions KERNEL 7.22, 8.04, 7.49, 7.53,…
CVE-2021-38181 — High (CVSS 7.5): SAP NetWeaver AS ABAP and ABAP Platform - versions 700, 701, 702, 730, 731, 740, 750, 751, 752, 753, 754, 755, 756,…
CVE-2021-33677 — High (CVSS 7.5): SAP NetWeaver ABAP Server and ABAP Platform, versions - 700, 702, 730, 731, 804, 740, 750, 784, expose functions to…
CVE-2021-27633 — High (CVSS 7.5): SAP NetWeaver AS for ABAP (RFC Gateway), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC -…

All CVEs affecting Sap Netweaver Abap →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-101077 — Critical (CVSS 10.0): A flaw has been found in Netcore NR289-GE 1.4.5102. This impacts the function process_request of the component boa_temp…
CVE-2026-100886 — Critical (CVSS 10.0): A vulnerability was identified in Seetong T8108, T8108P, T8116 and T8232 4.6.1.4-build202604241011. The affected…
CVE-2026-77244 — Critical (CVSS 10.0): MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0,…
CVE-2026-94493 — Critical (CVSS 10.0): A vulnerability was detected in Gigatech PDV5701 1.0.31_240305_112640. This issue affects some unknown processing of…
CVE-2026-83099 — Critical (CVSS 10.0): Vulnerability in the Oracle Forms product of Oracle Fusion Middleware (component: Forms Services, C/S, Charmode).…
CVE-2026-83059 — Critical (CVSS 10.0): Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server).…

Browse all CWE-287 (Improper Authentication) vulnerabilities →