How severe is CVE-2009-0323?

CVE-2009-0323 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2009-0323 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 62% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0323?

CVE-2009-0323 primarily affects W3 Amaya. In total, 71 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0323?

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-2009-0323 published?

CVE-2009-0323 was published on 2009-01-28 and last updated on 2026-06-16.

CVE-2009-0323

CVE-2009-0323 is a critical-severity vulnerability in W3 Amaya with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 62% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 62% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: W3 Amaya
Published: 2009-01-28
Last modified: 2026-06-16

Description

Multiple stack-based buffer overflows in W3C Amaya Web Browser 10.0 and 11.0 allow remote attackers to execute arbitrary code via (1) a long type parameter in an input tag, which is not properly handled by the EndOfXmlAttributeValue function; (2) an "HTML GI" in a start tag, which is not properly handled by the ProcessStartGI function; and unspecified vectors in (3) html2thot.c and (4) xml2thot.c, related to the msgBuffer variable. NOTE: these are different vectors than CVE-2008-6005.

Frequently asked questions

What is CVE-2009-0323?: Multiple stack-based buffer overflows in W3C Amaya Web Browser 10.0 and 11.0 allow remote attackers to execute arbitrary code via (1) a long type parameter in an input tag, which is not properly handled by the EndOfXmlAttributeValue function; (2) an "HTML GI" in a start tag, which is not properly handled by the ProcessStartGI function; and unspecified vectors in (3) html2thot.c and (4) xml2thot.c, related to the msgBuffer variable. NOTE: these are different vectors than CVE-2008-6005.
How severe is CVE-2009-0323?: CVE-2009-0323 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2009-0323 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 62% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0323?: CVE-2009-0323 primarily affects W3 Amaya. In total, 71 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0323?: 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-2009-0323 published?: CVE-2009-0323 was published on 2009-01-28 and last updated on 2026-06-16.

References

Affected products (71)

cpe:2.3:a:w3:amaya:*:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:0.9:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:0.95b:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.0:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.0a:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.1:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.1a:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.1c:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.2:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.2a:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.3:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.3a:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.3b:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.4:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:1.4a:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:2.0:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:2.1:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:2.2:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:2.3:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:2.4:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:3.0:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:3.1:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:3.2:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:3.2.1:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:4.0:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:4.1:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:4.2:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:4.2.1:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:4.3:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:4.3.1:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:4.3.2:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:5.0:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:5.1:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:5.2:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:5.3:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:6.0:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:6.1:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:6.2:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:6.3:*:*:*:*:*:*:*
cpe:2.3:a:w3:amaya:6.4:*:*:*:*:*:*:*

More vulnerabilities in W3 Amaya

CVE-2009-1209 — Critical (CVSS 9.3): Stack-based buffer overflow in W3C Amaya Web Browser 11.1 allows remote attackers to execute arbitrary code via a…

All CVEs affecting W3 Amaya →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →