CVE-2009-4012

CVE-2009-4012 is a critical-severity vulnerability in Linux.thai Libthai with a CVSS 2.0 base score of 10.0. 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

Description

Multiple integer overflows in LibThai before 0.1.13 might allow context-dependent attackers to execute arbitrary code via long strings that trigger heap-based buffer overflows, related to (1) thbrk/thbrk.c and (2) thwbrk/thwbrk.c. NOTE: some of these details are obtained from third party information.

Frequently asked questions

What is CVE-2009-4012?
Multiple integer overflows in LibThai before 0.1.13 might allow context-dependent attackers to execute arbitrary code via long strings that trigger heap-based buffer overflows, related to (1) thbrk/thbrk.c and (2) thwbrk/thwbrk.c. NOTE: some of these details are obtained from third party information.
How severe is CVE-2009-4012?
CVE-2009-4012 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2009-4012 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4012?
CVE-2009-4012 primarily affects Linux.thai Libthai. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4012?
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-2009-4012 published?
CVE-2009-4012 was published on 2010-01-19 and last updated on 2026-06-16.

References

Affected products (13)

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