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 2% (72nd 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: 2% (72nd 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 2% (72nd 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:*:*:*:*:*:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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