How severe is CVE-2017-1000121?

CVE-2017-1000121 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-2017-1000121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-1000121?

CVE-2017-1000121 affects Webkitgtk Webkitgtk+. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-1000121?

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-2017-1000121 published?

CVE-2017-1000121 was published on 2017-11-01 and last updated on 2026-06-17.

CVE-2017-1000121

CVE-2017-1000121 is a critical-severity vulnerability in Webkitgtk Webkitgtk+ with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Webkitgtk Webkitgtk+
Published: 2017-11-01
Last modified: 2026-06-17

Description

The UNIX IPC layer in WebKit, including WebKitGTK+ prior to 2.16.3, does not properly validate message size metadata, allowing a compromised secondary process to trigger an integer overflow and subsequent buffer overflow in the UI process. This vulnerability does not affect Apple products.

Frequently asked questions

What is CVE-2017-1000121?: The UNIX IPC layer in WebKit, including WebKitGTK+ prior to 2.16.3, does not properly validate message size metadata, allowing a compromised secondary process to trigger an integer overflow and subsequent buffer overflow in the UI process. This vulnerability does not affect Apple products.
How severe is CVE-2017-1000121?: CVE-2017-1000121 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-2017-1000121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-1000121?: CVE-2017-1000121 affects Webkitgtk Webkitgtk+. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-1000121?: 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-2017-1000121 published?: CVE-2017-1000121 was published on 2017-11-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:webkitgtk:webkitgtk\+:*:*:*:*:*:*:*:*

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