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CVE Record

CVE-2020-23311: There is an Assertion 'context_p->token.type == LEXER_RIGHT_BRACE || context_p->token.type == LEXER_ASSIGN...

There is an Assertion 'context_p->token.type == LEXER_RIGHT_BRACE || context_p->token.type == LEXER_ASSIGN || context_p->token.type == LEXER_COMMA' failed at js-parser-expr.c:3230 in parser_parse_object_initializer in JerryScript 2.2.0.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2020-23311 describes an assertion failure in JerryScript 2.2.0 while parsing a JavaScript object initializer. In business terms, the known concern is stability: software embedding this engine may crash if the vulnerable parser path is reachable. Public severity, CVSS, and affected-product metadata are incomplete.

Executive priority

Treat this as a targeted inventory and stability risk, not a confirmed emergency. Prioritize systems that embed JerryScript and process untrusted scripts, especially in operational or customer-facing products.

Technical view

The CVE reports a failed assertion in `parser_parse_object_initializer` at `js-parser-expr.c:3230`, checking token types during object initializer parsing. The source names JerryScript 2.2.0, but the CVE affected-product fields are not populated. Available evidence does not establish code execution, privilege impact, or a fixed version.

Likely exposure

Most relevant exposure is software or firmware embedding JerryScript 2.2.0 and parsing attacker-controlled JavaScript. Environments that do not use JerryScript, or only parse trusted scripts, appear less exposed based on the provided sources.

Exploitation context

The source bundle does not show CISA KEV listing, active exploitation, a CVSS score, or exploit status. The issue appears parser-input dependent, but public evidence here is insufficient to describe weaponization or real-world exploitation.

Researcher notes

Evidence is sparse. The CVE description identifies a specific assertion failure and function, but does not include CVSS, CWE, complete affected metadata, exploit confirmation, or remediation. Any impact beyond crash or denial of service should be treated as unproven from these sources.

Mitigation direction

  • Inventory applications, devices, or firmware that embed JerryScript 2.2.0.
  • Check JerryScript project guidance and issue #3822 for fixed-version or mitigation details.
  • Avoid routing untrusted JavaScript into affected JerryScript parsers where feasible.
  • Monitor process crashes referencing `parser_parse_object_initializer` or `js-parser-expr.c`.

Validation and detection

  • Confirm whether JerryScript 2.2.0 exists in shipped binaries, dependencies, or firmware images.
  • Determine whether external users can influence JavaScript parsed by the engine.
  • Review crash telemetry for assertion failures matching the cited function or source file.
  • Track the CVE and JerryScript issue for updated severity or remediation information.
Prepared
Confidence
low
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2020-23311 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.