CVE-2020-7771
Prototype Pollution
The package asciitable.js before 1.0.3 are vulnerable to Prototype Pollution via the main function.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Prototype Pollution
The package asciitable.js before 1.0.3 are vulnerable to Prototype Pollution via the main function.
- Record
CVE-2020-7771- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
EUVDEUVD-2021-0768
The package asciitable.js before 1.0.3 are vulnerable to Prototype Pollution via the main function.
- Record
EUVD-2021-0768- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5pxj-mhwj-x5gv
Prototype Pollution in asciitable.js
The package asciitable.js before 1.0.3 is vulnerable to Prototype Pollution via the main function.
PoC
var a = require("asciitable.js");
var b = JSON.parse('{"__proto__":{"test":123}}');
a({},b);
console.log({}.test)
- Record
GHSA-5pxj-mhwj-x5gv- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
NVD
The package asciitable.js before 1.0.3 are vulnerable to Prototype Pollution via the main function.
- Record
CVE-2020-7771- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-1321
- Updated
- 2026-11-02
OSV
The package asciitable.js before 1.0.3 are vulnerable to Prototype Pollution via the main function.
- Record
CVE-2020-7771- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-5pxj-mhwj-x5gv
Prototype Pollution in asciitable.js
The package asciitable.js before 1.0.3 is vulnerable to Prototype Pollution via the main function.
PoC
var a = require("asciitable.js");
var b = JSON.parse('{"__proto__":{"test":123}}');
a({},b);
console.log({}.test)
- Record
GHSA-5pxj-mhwj-x5gv- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
asciitable.jsnpm |
before 1.0.3 | 1.0.3 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-7771 is a high vulnerability (CVSS 7.5) in Asciitable.js Project Asciitable.js, published January 4, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.96%, the 80th percentile. Fixed in asciitable.js 1.0.3.