How severe is CVE-2009-0839?

CVE-2009-0839 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2009-0839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0839?

CVE-2009-0839 primarily affects Osgeo Mapserver. In total, 42 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0839?

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-2009-0839 published?

CVE-2009-0839 was published on 2009-03-31 and last updated on 2026-06-16.

CVE-2009-0839

CVE-2009-0839 is a critical-severity vulnerability in Osgeo Mapserver 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-119.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Osgeo Mapserver
Published: 2009-03-31
Last modified: 2026-06-16

Description

Stack-based buffer overflow in mapserv.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2, when the server has a map with a long IMAGEPATH or NAME attribute, allows remote attackers to execute arbitrary code via a crafted id parameter in a query action.

Frequently asked questions

What is CVE-2009-0839?: Stack-based buffer overflow in mapserv.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2, when the server has a map with a long IMAGEPATH or NAME attribute, allows remote attackers to execute arbitrary code via a crafted id parameter in a query action.
How severe is CVE-2009-0839?: CVE-2009-0839 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2009-0839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0839?: CVE-2009-0839 primarily affects Osgeo Mapserver. In total, 42 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0839?: 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-2009-0839 published?: CVE-2009-0839 was published on 2009-03-31 and last updated on 2026-06-16.

References

Affected products (42)

cpe:2.3:a:osgeo:mapserver:4.2.0:beta1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.4.0:*:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.4.0:beta1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.4.0:beta2:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.4.0:beta3:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.6.0:*:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.6.0:beta1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.6.0:beta2:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.6.0:beta3:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.6.0:rc1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.8.0:beta1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.8.0:beta2:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.8.0:beta3:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.8.0:rc1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.8.0:rc2:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.10.0:*:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.10.0:beta1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.10.0:beta2:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.10.0:beta3:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.10.0:rc1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.10.1:*:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.10.2:*:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:4.10.3:*:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.0.0:*:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.0.0:beta3:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.0.0:beta4:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.0.0:beta5:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.0.0:beta6:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.2.0:*:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.2.0:beta1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.2.0:beta2:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.2.0:beta3:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.2.0:beta4:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:osgeo:mapserver:5.2.1:*:*:*:*:*:*:*
cpe:2.3:a:umn:mapserver:4.0:*:*:*:*:*:*:*

More vulnerabilities in Osgeo Mapserver

CVE-2010-2540 — Critical (CVSS 10.0): mapserv.c in mapserv in MapServer before 4.10.6 and 5.x before 5.6.4 does not properly restrict the use of CGI…
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CVE-2009-1177 — Critical (CVSS 10.0): Multiple stack-based buffer overflows in maptemplate.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2…
CVE-2009-1176 — Critical (CVSS 10.0): mapserv.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2 does not ensure that the string holding the id…
CVE-2009-0841 — Critical (CVSS 10.0): Directory traversal vulnerability in mapserv.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2, when…
CVE-2009-0840 — Critical (CVSS 10.0): Heap-based buffer underflow in the readPostBody function in cgiutil.c in mapserv in MapServer 4.x before 4.10.4 and 5.x…

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