How severe is CVE-2020-1961?

CVE-2020-1961 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-2020-1961 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-1961?

CVE-2020-1961 affects Apache Syncope. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-1961?

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-2020-1961 published?

CVE-2020-1961 was published on 2020-05-04 and last updated on 2026-06-17.

CVE-2020-1961

CVE-2020-1961 is a critical-severity vulnerability in Apache Syncope 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-74.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Apache Syncope
Published: 2020-05-04
Last modified: 2026-06-17

Description

Vulnerability to Server-Side Template Injection on Mail templates for Apache Syncope 2.0.X releases prior to 2.0.15, 2.1.X releases prior to 2.1.6, enabling attackers to inject arbitrary JEXL expressions, leading to Remote Code Execution (RCE) was discovered.

Frequently asked questions

What is CVE-2020-1961?: Vulnerability to Server-Side Template Injection on Mail templates for Apache Syncope 2.0.X releases prior to 2.0.15, 2.1.X releases prior to 2.1.6, enabling attackers to inject arbitrary JEXL expressions, leading to Remote Code Execution (RCE) was discovered.
How severe is CVE-2020-1961?: CVE-2020-1961 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-2020-1961 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-1961?: CVE-2020-1961 affects Apache Syncope. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-1961?: 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-2020-1961 published?: CVE-2020-1961 was published on 2020-05-04 and last updated on 2026-06-17.

References

http://syncope.apache.org/security

Affected products (1)

cpe:2.3:a:apache:syncope:*:*:*:*:*:*:*:*

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