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CVE-2009-2473· NVD / CVE Program· CNA redhat

neon before 0.28.6, when expat is used, does not properly detect recursion during entity expansion, which allows context-dependent attackers

Noroxi assessment

Priority: Monitor (action score 20/100)

  • Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 8.4% (FIRST EPSS); higher than 94.9% of all records.
  • Fixed version: neon (Red Hat:enterprise_linux:4::as) 0:0.24.7-4.el4_8.2; neon-debuginfo (Red Hat:enterprise_linux:4::as) 0:0.24.7-4.el4_8.2; neon-devel (Red Hat:enterprise_linux:4::as) 0:0.24.7-4.el4_8.2.

Low priority for now. Upgrade to neon (Red Hat:enterprise_linux:4::as) 0:0.24.7-4.el4_8.2; neon-debuginfo (Red Hat:enterprise_linux:4::as) 0:0.24.7-4.el4_8.2; neon-devel (Red Hat:enterprise_linux:4::as) 0:0.24.7-4.el4_8.2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

neon before 0.28.6, when expat is used, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.

MediumCVSS 4.3 · v2.0—Proof of concept Fix available
Published
Aug 21, 2009
Updated
Jun 16, 2026
EPSS
8.4% · 94th percentile

Report tools

JSON

Action score

20

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
3 / 30 · 8.4%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
webdavneon

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • webdav neon0.28.6

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Red Hat:enterprise_linux:4::asneonbefore 0:0.24.7-4.el4_8.20:0.24.7-4.el4_8.2
Red Hat:enterprise_linux:4::asneon-debuginfobefore 0:0.24.7-4.el4_8.20:0.24.7-4.el4_8.2
Red Hat:enterprise_linux:4::asneon-develbefore 0:0.24.7-4.el4_8.20:0.24.7-4.el4_8.2
Red Hat:enterprise_linux:5::clientgnome-vfs2-smbbefore 0:2.16.2-10.el50:2.16.2-10.el5
Red Hat:enterprise_linux:5::client_workstationgnome-vfs2before 0:2.16.2-10.el50:2.16.2-10.el5
Red Hat:enterprise_linux:5::client_workstationgnome-vfs2-debuginfobefore 0:2.16.2-10.el50:2.16.2-10.el5
Red Hat:enterprise_linux:5::client_workstationgnome-vfs2-develbefore 0:2.16.2-10.el50:2.16.2-10.el5
Red Hat:enterprise_linux:5::client_workstationneonbefore 0:0.25.5-10.el5_4.10:0.25.5-10.el5_4.1
Red Hat:enterprise_linux:5::client_workstationneon-debuginfobefore 0:0.25.5-10.el5_4.10:0.25.5-10.el5_4.1
Red Hat:enterprise_linux:5::client_workstationneon-develbefore 0:0.25.5-10.el5_4.10:0.25.5-10.el5_4.1

Same product

webdav: all records

Other highest-scoring records for the same primary product.

  • CVE-2004-0179Multiple format string vulnerabilities in (1) neon 0.24.4 and earlier, and other products that use neon including (2) Cadaver, (3) Subversio
    30Monitor
  • CVE-2009-2474neon before 0.28.6, when OpenSSL or GnuTLS is used, does not properly handle a '\0' character in a domain name in the subject's Common Name
    23Monitor
  • CVE-2008-3746neon 0.28.0 through 0.28.2 allows remote servers to cause a denial of service (NULL pointer dereference and crash) via vectors related to Di
    18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
red hat:gnome-vfs20:2.16.2-10.el5 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:gnome-vfs2-debuginfo0:2.16.2-10.el5 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:gnome-vfs2-devel0:2.16.2-10.el5 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:gnome-vfs2-smb0:2.16.2-10.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:neon0:0.24.7-4.el4_8.2 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:neon-debuginfo0:0.24.7-4.el4_8.2 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:neon-devel0:0.24.7-4.el4_8.2 · Red Hat:enterprise_linux:4::asPackage registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrydos2009-11-12

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+82 d
  3. TodayOct 21, 2026+6270 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

    If successful

    Confidentiality
    none
    Integrity
    none
    Availability
    P · the service can be disrupted
    Attack complexity
    M
    Confidentiality impact
    None
    Integrity impact
    None
    Availability impact
    P

    Weakness class (CWE)

    CWE-399 · Resource Management Errors

    CVSS vector

    AV:N/AC:M/Au:N/C:N/I:N/A:P

    nvd-primary

    Attack context

    MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

    MITRE has no CAPEC/ATT&CK mapping for this CWE.

    Change log

    1. Fix✗ → ✓

    For records you follow, these changes also arrive as notifications. →

    References

    Show all references (12 more)

    Vendor advisories and official records. Exploit/PoC links are deliberately left out.

    All records