How severe is CVE-2021-21479?

CVE-2021-21479 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2021-21479 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21479?

CVE-2021-21479 affects Sap Scimono. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21479?

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-2021-21479 published?

CVE-2021-21479 was published on 2021-02-09 and last updated on 2026-06-17.

CVE-2021-21479

CVE-2021-21479 is a critical-severity vulnerability in Sap Scimono with a CVSS 3.x base score of 9.1. 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-74.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 10% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Sap Scimono
Published: 2021-02-09
Last modified: 2026-06-17

Description

In SCIMono before 0.0.19, it is possible for an attacker to inject and execute java expression compromising the availability and integrity of the system.

Frequently asked questions

What is CVE-2021-21479?: In SCIMono before 0.0.19, it is possible for an attacker to inject and execute java expression compromising the availability and integrity of the system.
How severe is CVE-2021-21479?: CVE-2021-21479 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2021-21479 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21479?: CVE-2021-21479 affects Sap Scimono. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21479?: 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-2021-21479 published?: CVE-2021-21479 was published on 2021-02-09 and last updated on 2026-06-17.

References

https://github.com/SAP/scimono/security/advisories/GHSA-29q4-gxjq-rx5c

Affected products (1)

cpe:2.3:a:sap:scimono:*:*:*:*:*:*:*:*

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