How severe is CVE-2017-8658?

CVE-2017-8658 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-8658 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-8658?

CVE-2017-8658 affects Microsoft Chakracore. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-8658?

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

When was CVE-2017-8658 published?

CVE-2017-8658 was published on 2017-08-11 and last updated on 2026-06-17.

CVE-2017-8658

CVE-2017-8658 is a critical-severity vulnerability in Microsoft Chakracore with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 20% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 20% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microsoft Chakracore
Published: 2017-08-11
Last modified: 2026-06-17

Description

A remote code execution vulnerability exists in the way that the Chakra JavaScript engine renders when handling objects in memory, aka "Scripting Engine Memory Corruption Vulnerability".

Frequently asked questions

What is CVE-2017-8658?: A remote code execution vulnerability exists in the way that the Chakra JavaScript engine renders when handling objects in memory, aka "Scripting Engine Memory Corruption Vulnerability".
How severe is CVE-2017-8658?: CVE-2017-8658 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-8658 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-8658?: CVE-2017-8658 affects Microsoft Chakracore. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-8658?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-8658 published?: CVE-2017-8658 was published on 2017-08-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:microsoft:chakracore:*:*:*:*:*:*:*:*

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