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Vulnerabilities

Vulnerability · CVE-2009-1955

CVE-2009-1955 is listed by inventory_critical.

Published Jun 8, 2009 · catalog updated Jun 16, 2026 · the affected product

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2009-1955 is not in CISA KEV. FIRST estimates a 52.99% chance of exploitation in the next 30 days. Check whether you run the affected product.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
52.99%
Remediation
Version ranges on file
Affected products
cpe apache/apr-util · cpe apple/mac os x · cpe canonical/ubuntu linux · cpe debian/debian linux

CVE-2009-1955 is listed by inventory_critical.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apache/apr-util< 1.3.7
  • cpe apple/mac os x< 10.6.2
  • cpe canonical/ubuntu linux6.06
  • cpe canonical/ubuntu linux8.04
  • cpe canonical/ubuntu linux8.10
  • cpe debian/debian linux4.0

How to fix CVE-2009-1955

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2009-1955 is not in CISA KEV. FIRST estimates a 52.99% chance of exploitation in the next 30 days. Check whether you run the affected product.

Which versions are affected?

Compare what you have installed with apple/mac os x < 10.6.2; canonical/ubuntu linux 6.06; canonical/ubuntu linux 8.04; canonical/ubuntu linux 8.10. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-776. EPSS 52.99%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 8, 2009 · Monitored products — critical

    Detected

    CVE-2009-1955 is listed by inventory_critical.

  2. Jun 16, 2026 · Monitored products — critical

    Updated

    CVE-2009-1955 is listed by inventory_critical.

Sources

  • CVE.orgVulnerability recordCVE-2009-1955

    Official CVE identifier

    cve.org
  • Monitored products — criticalVendor advisoryCVE-2009-1955

    The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 4, 2026