CVE-2020-5219Network attack vector

Code execution via inherited prototype-chain access

Published Jan 24, 2020 · Updated Aug 4, 2024

Code injection in Peerigon angular-expressions before 1.0.1 allows remote attackers to execute JavaScript via a crafted expression. The compile parser permits inherited prototype-chain properties, letting an expression obtain native functions such as the Function constructor instead of restricting access to an object's own properties. Exploitation requires application code to pass attacker-controlled text to expressions.compile; resulting code runs as browser script or with the server process's privileges.

CVSS severity8.7
High
EPSS probability2.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Peerigon angular-expressions before 1.0.1 allows remote attackers to execute JavaScript via a crafted expression. The compile parser permits inherited prototype-chain properties, letting an expression obtain native functions such as the Function constructor instead of restricting access to an object's own properties. Exploitation requires application code to pass attacker-controlled text to expressions.compile; resulting code runs as browser script or with the server process's privileges.

The record

CVE
CVE-2020-5219
Published
Jan 24, 2020
Updated
Aug 4, 2024
Vendor
Peerigon
Product
angular-expressions
Classifications
CWE-74, T1203
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=< 1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Peerigon · angular-expressionsversion=< 1.0.1

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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