CVE-2020-7771Public exploitNetwork attack vector

Service interruption via recursive options merge

Published Jan 4, 2021 · Updated Sep 17, 2024

Prototype pollution in asciitable.js before 1.0.3 allows attackers to cause a service interruption through crafted options. The main function's defaults helper recursively copies attacker-controlled option keys and follows proto into Object.prototype, thereby writing shared properties. Reachability requires a consuming browser or Node.js application to pass attacker-controlled option data to the function; the CNA assessment limits direct impact to availability.

CVSS severity7.5
High
EPSS probability1.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in asciitable.js before 1.0.3 allows attackers to cause a service interruption through crafted options. The main function's defaults helper recursively copies attacker-controlled option keys and follows proto into Object.prototype, thereby writing shared properties. Reachability requires a consuming browser or Node.js application to pass attacker-controlled option data to the function; the CNA assessment limits direct impact to availability.

The record

CVE
CVE-2020-7771
Published
Jan 4, 2021
Updated
Sep 17, 2024
Vendor
Victor Nunes
Product
asciitable.js
Classifications
CWE-1321
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <1.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Victor Nunes · asciitable.jsversion=unspecified <1.0.3

Published CVSS scores

7.5SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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