Is CVE-2009-0840 actively exploited?

CVE-2009-0840 has no public evidence of in-the-wild exploitation as of 2026-04-23.

What is the CVSS score for CVE-2009-0840?

CVE-2009-0840 has a CVSS score of 10 (UNKNOWN severity). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

How do I patch CVE-2009-0840?

Patch guidance is available from osgeo security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2009-0840.

CVE-2009-0840 - remediation guidance & executive summary

Q: Which products are affected by CVE-2009-0840?

42 products: osgeo mapserver, osgeo mapserver, osgeo mapserver, osgeo mapserver, osgeo mapserver, and 37 more.

Description

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.

CVSS Metrics

Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Access Vector: network
Access Cmplx: low
Auth: none
Confidentiality: complete
Integrity: complete
Availability: complete
Weaknesses: CWE-119 · Memory Buffer Errors

Metadata

Primary Vendor: OSGEO
Published: 3/31/2009
Last Modified: 4/23/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

osgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverosgeo : mapserverumn : mapserverumn : mapserverumn : mapserver

Remediation Guidance

Executive Summary

View on NIST NVD