How severe is CVE-2008-1377?

CVE-2008-1377 has a CVSS 2.0 base score of 9.0, rated critical severity.

Is CVE-2008-1377 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-1377?

CVE-2008-1377 affects X X11. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2008-1377?

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-2008-1377 published?

CVE-2008-1377 was published on 2008-06-16 and last updated on 2026-06-16.

CVE-2008-1377

CVE-2008-1377 is a critical-severity vulnerability in X X11 with a CVSS 2.0 base score of 9.0. 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-189.

Key facts

Severity: Critical (CVSS 2.0 base score 9.0)
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: X X11
Published: 2008-06-16
Last modified: 2026-06-16

Description

The (1) SProcRecordCreateContext and (2) SProcRecordRegisterClients functions in the Record extension and the (3) SProcSecurityGenerateAuthorization function in the Security extension in the X server 1.4 in X.Org X11R7.3 allow context-dependent attackers to execute arbitrary code via requests with crafted length values that specify an arbitrary number of bytes to be swapped on the heap, which triggers heap corruption.

Frequently asked questions

What is CVE-2008-1377?: The (1) SProcRecordCreateContext and (2) SProcRecordRegisterClients functions in the Record extension and the (3) SProcSecurityGenerateAuthorization function in the Security extension in the X server 1.4 in X.Org X11R7.3 allow context-dependent attackers to execute arbitrary code via requests with crafted length values that specify an arbitrary number of bytes to be swapped on the heap, which triggers heap corruption.
How severe is CVE-2008-1377?: CVE-2008-1377 has a CVSS 2.0 base score of 9.0, rated critical severity.
Is CVE-2008-1377 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-1377?: CVE-2008-1377 affects X X11. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2008-1377?: 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-2008-1377 published?: CVE-2008-1377 was published on 2008-06-16 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:x:x11:r7.3:*:*:*:*:*:*:*

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