How severe is CVE-2020-13942?

CVE-2020-13942 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-2020-13942 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 68% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-13942?

CVE-2020-13942 affects Apache Unomi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-13942?

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-2020-13942 published?

CVE-2020-13942 was published on 2020-11-24 and last updated on 2026-06-17.

CVE-2020-13942

CVE-2020-13942 is a critical-severity vulnerability in Apache Unomi with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 68% places it in the 99th percentile, indicating an elevated likelihood of exploitation. 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: 68% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Apache Unomi
Published: 2020-11-24
Last modified: 2026-06-17

Description

It is possible to inject malicious OGNL or MVEL scripts into the /context.json public endpoint. This was partially fixed in 1.5.1 but a new attack vector was found. In Apache Unomi version 1.5.2 scripts are now completely filtered from the input. It is highly recommended to upgrade to the latest available version of the 1.5.x release to fix this problem.

Frequently asked questions

What is CVE-2020-13942?: It is possible to inject malicious OGNL or MVEL scripts into the /context.json public endpoint. This was partially fixed in 1.5.1 but a new attack vector was found. In Apache Unomi version 1.5.2 scripts are now completely filtered from the input. It is highly recommended to upgrade to the latest available version of the 1.5.x release to fix this problem.
How severe is CVE-2020-13942?: CVE-2020-13942 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-2020-13942 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 68% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-13942?: CVE-2020-13942 affects Apache Unomi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-13942?: 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-2020-13942 published?: CVE-2020-13942 was published on 2020-11-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:unomi:*:*:*:*:*:*:*:*

More vulnerabilities in Apache Unomi

CVE-2020-11975 — Critical (CVSS 9.8): Apache Unomi allows conditions to use OGNL scripting which offers the possibility to call static Java classes from the…
CVE-2021-31164 — High (CVSS 7.5): Apache Unomi prior to version 1.5.5 allows CRLF log injection because of the lack of escaping in the log statements.

All CVEs affecting Apache Unomi →

Other CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities

CVE-2026-25586 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty…
CVE-2026-25520 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped.…
CVE-2025-20265 — Critical (CVSS 10.0): A vulnerability in the RADIUS subsystem implementation of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2025-20337 — Critical (CVSS 10.0): A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2025-20281 — Critical (CVSS 10.0): A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2024-42472 — Critical (CVSS 10.0): Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.14.0 and 1.15.10, a malicious…

Browse all CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities →