Known exploited · Apache

CVE-2020-1956: Apache Kylin OS Command Injection Vulnerability

What it is

Apache Kylin contains an OS command injection vulnerability which could permit an attacker to perform remote code execution.

Added March 25, 2022Due April 15, 2022CISA KEV catalog 2026.10.01

Vendor: Apache
Product: Kylin
Added to KEV: March 25, 2022
CISA due date: April 15, 2022
Ransomware use: Unknown
Weakness: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

What CISA requires

Apply updates per vendor instructions.

Forensic triage

What to do now

Find every instance of Kylin you run, including the forgotten ones, and check its version against the vendor advisory.
Apply the vendor's fix or mitigation, before April 15, 2022 if you are bound by CISA's deadline, sooner if it faces the internet.
Assume it was tried against you already: look for signs of exploitation from the date it was added, not from the day you patched.
Until every instance is patched, block the attack at the edge: a WAF in blocking mode stops OS command injection payloads, including Shellshock.

References

https://nvd.nist.gov/vuln/detail/CVE-2020-1956

CVE-2020-1956 in the National Vulnerability Database

The Dome

Block it at the edge while you patch

The Dome's WAF runs the OWASP Core Rule Set in blocking mode and stops OS command injection payloads, including Shellshock before they reach your application.

See the Dome

T Academy

Train the engineers who fix it

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Source: CISA Known Exploited Vulnerabilities Catalog (public domain), catalog version 2026.10.01.