NVD / CVE Program· CNA apache

CVE-2020-1956: 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

Noroxi assessment

Priority: Now (action score 94/100)

CISA has confirmed exploitation in the wild (Mar 25, 2022). Remediation deadline for US federal agencies: Apr 15, 2022.
A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
Probability of exploitation in the next 30 days: 97.3% (FIRST EPSS); higher than 99.8% of all records.
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: org.apache.kylin:kylin-core-common (Maven) 3.0.2, 2.6.6.

Patch today or shut off access. Upgrade to org.apache.kylin:kylin-core-common (Maven) 3.0.2, 2.6.6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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.

HighCVSS 8.8 · v3.1KEVWeaponized Fix available

Published: May 22, 2020
Updated: Jun 16, 2026
EPSS: 97.3% · 99th percentile
CWE: CWE-78

Report tools

JSON

Action score

Now

Patch today or shut off access.

CVSS: 35 / 40 · 8.8 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 29 / 30 · 97.3%

CISA SSVC decision

Exploitation: active
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Mar 25, 2022. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Apr 15, 2022.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
apache	kylin	cpe:2.3:a:apache:kylin

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

apache kylin2.3.0 and later · up to 2.3.2 inclusive
apache kylin2.5.0 and later · up to 2.5.2 inclusive
apache kylin2.6.0 and later · up to 2.6.5 inclusive
apache kylin2.4.0
apache kylin2.4.1
apache kylin3.0.0
apache kylin3.0.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

Apache Kylin
- 2.3.0, <=2.6.5, <=3.0.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Maven	org.apache.kylin:kylin-core-common	from 3.0.0 · before 3.0.2	3.0.2
Maven	org.apache.kylin:kylin-core-common	before 2.6.6	2.6.6

Same product

apache: all records

Other highest-scoring records for the same primary product.

CVE-2021-45456Apache kylin checks the legitimacy of the project before executing some commands with the project name passed in by the user.
66This week
CVE-2022-24697Apache Kylin prior to 4.0.2 allows command injection when the configuration overwrites function overwrites system parameters
64This week
CVE-2022-43396Apache Kylin: Command injection by Useless configuration
52Plan

Published before and after this one in the same product

← EarlierCVE-2020-1937Feb 24, 2020 · Kylin has some restful apis which will concatenate SQLs with the user input string, a user is likely to be able to run malicious database qu
36Monitor
Later →CVE-2020-13925Jul 14, 2020 · Similar to CVE-2020-1956, Kylin has one more restful API which concatenates the API inputs into OS commands and then executes them on the se
45Plan
Later →CVE-2020-13926Jul 14, 2020 · Kylin concatenates and executes a Hive SQL in Hive CLI or beeline when building a new segment; some part of the HQL is from system configura
40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Maven:org.apache.kylin:kylin-core-common	2.6.6	Package registry (OSV)
Maven:org.apache.kylin:kylin-core-common	3.0.2	Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Nuclei detection template ×1
Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Nuclei detection template	Nuclei template CVE-2020-1956	—
Proof-of-concept repository on GitHub	stars:0	2021-07-08

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedMay 22, 2020
First PoCJul 8, 2021+412 d
CISA KEVMar 25, 2022+672 d
TodayNov 3, 2026+2356 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.

The bug in code

The whole CWE-78 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const host = req.body.host;
2exec("ping -c 1 " + host, onResult);

Fixed

1const host = req.body.host;
2if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);
3execFile("ping", ["-c", "1", host], onResult);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:48 PM UTC

For records you follow, these changes also arrive as notifications. →

References

www.openwall.com/lists/oss-security/2020/07/14/1

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

What does it mean in your environment?

We use this product, ask for help

Data sources and verification

CNA: apache

CVE.org (CNA)Oct 21, 2025, 11:35 PM UTC
CISA ADPOct 21, 2025, 11:35 PM UTC
NVDJun 16, 2026, 11:02 PM UTC
FIRST EPSSOct 25, 2026, 12:00 AM UTC
OSV / GHSANov 3, 2026, 3:17 AM UTC
NucleiNov 3, 2026, 3:17 AM UTC
PoC-in-GitHubNov 3, 2026, 3:17 AM UTC

Each line is when that source was last processed for this record.