CVE-2020-13622Public exploitNetwork attack vector

Interpreter crash via unfiltered Proxy symbol keys

Published May 26, 2020 · Updated Aug 4, 2024

Reachable assertion in JerryScript 2.2.0 allows attackers to crash the interpreter by processing a crafted Proxy object. The Proxy property-key query returns symbol keys when symbols were not requested, causing JSON serialization to pass a symbol to ecma_get_string_from_value and trigger its string assertion. Execution of attacker-controlled JavaScript in an embedding application is required, and the documented result is an abort with a core dump rather than data disclosure or modification.

CVSS severity7.5
High
EPSS probability1.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reachable assertion in JerryScript 2.2.0 allows attackers to crash the interpreter by processing a crafted Proxy object. The Proxy property-key query returns symbol keys when symbols were not requested, causing JSON serialization to pass a symbol to ecma_get_string_from_value and trigger its string assertion. Execution of attacker-controlled JavaScript in an embedding application is required, and the documented result is an abort with a core dump rather than data disclosure or modification.

The record

CVE
CVE-2020-13622
Published
May 26, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NISTAV:N/AC:L/Au:N/C:N/I:N/A:P

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 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-617Reachable Assertion
T1499Endpoint Denial of Service

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo