Heap-based buffer underflow in the readPostBody function in cgiutil.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2 allows remote attackers to have an unknown impact via a negative value in the Content-Length HTTP header.
CVE-2009-0840
NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 5%CVSS: —Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- —
- EG Score
- 0.0(none)
- EPSS
- 91.6%
- KEV
- Not listed
Published
March 31, 2009
Last Modified
April 23, 2026
References (24)
- cve@mitrehttp://lists.osgeo.org/pipermail/mapserver-users/2009-March/060600.html
- cve@mitrehttp://secunia.com/advisories/34520
- cve@mitrehttp://secunia.com/advisories/34603
- cve@mitrehttp://trac.osgeo.org/mapserver/ticket/2943
- cve@mitrehttp://www.debian.org/security/2009/dsa-1914
- cve@mitrehttp://www.positronsecurity.com/advisories/2009-000.html
- cve@mitrehttp://www.securityfocus.com/archive/1/502271/100/0/threaded
- cve@mitrehttp://www.securityfocus.com/bid/34306
- cve@mitrehttp://www.securitytracker.com/id?1021952
- cve@mitrehttps://exchange.xforce.ibmcloud.com/vulnerabilities/49545
- cve@mitrehttps://www.redhat.com/archives/fedora-package-announce/2009-April/msg00147.html
- cve@mitrehttps://www.redhat.com/archives/fedora-package-announce/2009-April/msg00170.html
- af854a3a-2127-422b-91ae-364da2661108http://lists.osgeo.org/pipermail/mapserver-users/2009-March/060600.html
- af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/34520
- af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/34603
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Frequently asked(4)
What is CVE-2009-0840?
CVE-2009-0840 is a none vulnerability published on March 31, 2009. Heap-based buffer underflow in the readPostBody function in cgiutil.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2 allows remote attackers to have an unknown impact via a negative value in the Content-Length HTTP header.
When was CVE-2009-0840 disclosed?
CVE-2009-0840 was first published in the National Vulnerability Database on March 31, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-0840 actively exploited?
CVE-2009-0840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-0840?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-0840, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
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