CVE-2020-1956

Exp

Apache Kylin 2.3.0, and releases up to 2.6.5 and 3.0.1 has some restful apis which will concatenate os command with the user input string, a user is likely to be able to execute any os command without any protection or validation.

Published: 2020-05-22 Last update: 2025-10-23 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-1956 is rated Critical Active Threat (95.6/100): CVSS High severity, with high exploitation likelihood (EPSS 94.11%, 100th percentile). CISA KEV confirms active exploitation (added 2022-03-25) affecting Apache / Kylin. a weakness (CWE-78) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2020-1956

Name: Apache Kylin OS Command Injection Vulnerability · CISA KEV detail

Exploit added: 2022-03-25

Action due: 2022-04-15

Required action: Apply updates per vendor instructions.

Public exploit references (Exploit-DB) for CVE-2020-1956

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-1956

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-11 93.72% 94.11% +0.38%
2 2026-06-02 93.88% 93.72% -0.16%
3 2026-03-01 — 93.88% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-1956

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
9.0 2.0 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 10.0 [email protected]

Weakness enumeration for CVE-2020-1956

GitHub Security Advisory for CVE-2020-1956

Affected software / configurations for CVE-2020-1956

Vendor Product Version Raw CPE
apache kylin >= 2.3.0, <= 2.3.2 cpe:2.3:a:apache:kylin:*:*:*:*:*:*:*:*
apache kylin >= 2.5.0, <= 2.5.2 cpe:2.3:a:apache:kylin:*:*:*:*:*:*:*:*
apache kylin >= 2.6.0, <= 2.6.5 cpe:2.3:a:apache:kylin:*:*:*:*:*:*:*:*
apache kylin 2.4.0 cpe:2.3:a:apache:kylin:2.4.0:*:*:*:*:*:*:*
apache kylin 2.4.1 cpe:2.3:a:apache:kylin:2.4.1:*:*:*:*:*:*:*
apache kylin 3.0.0 cpe:2.3:a:apache:kylin:3.0.0:-:*:*:*:*:*:*
apache kylin 3.0.0 cpe:2.3:a:apache:kylin:3.0.0:alpha:*:*:*:*:*:*
apache kylin 3.0.0 cpe:2.3:a:apache:kylin:3.0.0:alpha2:*:*:*:*:*:*
apache kylin 3.0.0 cpe:2.3:a:apache:kylin:3.0.0:beta:*:*:*:*:*:*
apache kylin 3.0.1 cpe:2.3:a:apache:kylin:3.0.1:*:*:*:*:*:*:*

References for CVE-2020-1956

URL Tags
http://www.openwall.com/lists/oss-security/2020/07/14/1 Mailing List
https://community.sonarsource.com/t/apache-kylin-3-0-1-command-injection-vulnerability/25706 Exploit Third Party Advisory
https://lists.apache.org/thread.html/r021baf9d8d4ae41e8c8332c167c4fa96c91b5086563d9be55d2d7acf%40%3Ccommits.kylin.apache.org%3E Mailing List Patch
https://lists.apache.org/thread.html/r1332ef34cf8e2c0589cf44ad269fb1fb4c06addec6297f0320f5111d%40%3Cuser.kylin.apache.org%3E Mailing List Mitigation Vendor Advisory
https://lists.apache.org/thread.html/r250a867961cfd6e0506240a9c7eaee782d84c6ab0091c7c4bc45f3eb%40%3Cannounce.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r250a867961cfd6e0506240a9c7eaee782d84c6ab0091c7c4bc45f3eb%40%3Cdev.kylin.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r250a867961cfd6e0506240a9c7eaee782d84c6ab0091c7c4bc45f3eb%40%3Cuser.kylin.apache.org%3E Mailing List
https://lists.apache.org/thread.html/r61666760d8a4e8764b2d5fe158d8a48b569414480fbfadede574cdc0%40%3Ccommits.kylin.apache.org%3E Mailing List Patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1956 Third Party Advisory US Government Resource
cvelogic Threat Intelligence