How severe is CVE-2020-23315?

CVE-2020-23315 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-23315 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-23315?

CVE-2020-23315 affects Microsoft Chakracore. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-23315?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-23315 published?

CVE-2020-23315 was published on 2022-01-20 and last updated on 2026-06-17.

CVE-2020-23315

CVE-2020-23315 is a high-severity vulnerability in Microsoft Chakracore with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Chakracore
Published: 2022-01-20
Last modified: 2026-06-17

Description

There is an ASSERTION (pFuncBody->GetYieldRegister() == oldYieldRegister) failed in Js::DebugContext::RundownSourcesAndReparse in ChakraCore version 1.12.0.0-beta.

Frequently asked questions

What is CVE-2020-23315?: There is an ASSERTION (pFuncBody->GetYieldRegister() == oldYieldRegister) failed in Js::DebugContext::RundownSourcesAndReparse in ChakraCore version 1.12.0.0-beta.
How severe is CVE-2020-23315?: CVE-2020-23315 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-23315 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-23315?: CVE-2020-23315 affects Microsoft Chakracore. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-23315?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-23315 published?: CVE-2020-23315 was published on 2022-01-20 and last updated on 2026-06-17.

References

https://github.com/microsoft/ChakraCore/issues/6453

Affected products (1)

cpe:2.3:a:microsoft:chakracore:1.12.0.0:beta:*:*:*:*:*:*

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