neon: billion laughs DoS attack
Published Aug 21, 2009
4.3
MEDIUMCVSS 2.0
EPSS 8.44%
Description
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.
Affected products
No data.
No data.
Red Hat Enterprise Linux 4
neon-0:0.24.7-4.el4_8.2
Fixed · RHSA-2009:1452
Red Hat Enterprise Linux 5
gnome-vfs2-0:2.16.2-10.el5
Fixed · RHSA-2013:0131
Red Hat Enterprise Linux 5
neon-0:0.25.5-10.el5_4.1
Fixed · RHSA-2009:1452
Red Hat Enterprise Linux 4
gnome-vfs2
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | neon-0:0.24.7-4.el4_8.2 | Fixed | RHSA-2009:1452 |
| Red Hat Enterprise Linux 5 | gnome-vfs2-0:2.16.2-10.el5 | Fixed | RHSA-2013:0131 |
| Red Hat Enterprise Linux 5 | neon-0:0.25.5-10.el5_4.1 | Fixed | RHSA-2009:1452 |
| Red Hat Enterprise Linux 4 | gnome-vfs2 | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 8.44% (0.08437) | 94.84th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.44% (0.08437) | 94.28th | v5 (v2026.06.15) |
| Jun 7, 2026 | 11.05% (0.11049) | 93.59th | v4 (v2025.03.14) |
| Apr 12, 2026 | 12.38% (0.12375) | 93.89th | v4 (v2025.03.14) |
| Dec 1, 2025 | 7.24% (0.07243) | 91.32th | v4 (v2025.03.14) |
| Jul 13, 2025 | 9.50% (0.09502) | 92.46th | v4 (v2025.03.14) |
| Mar 30, 2025 | 8.21% (0.08215) | 91.40th | v4 (v2025.03.14) |
| Mar 29, 2025 | 18.84% (0.18839) | 92.27th | v4 (v2025.03.14) |
| Mar 17, 2025 | 8.59% (0.08588) | 91.77th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.27% (0.00265) | 66.62th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.27% (0.00265) | 65.18th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.27% (0.00265) | 62.30th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.36% (0.05356) | 89.91th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.36% (0.05356) | 88.93th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.36% (0.05356) | 76.09th | v2 (v2022.01.01) |
References (17)
- http://lists.apple.com/archives/security-announce/2010//Nov/msg00000.html vendor-advisoryx_refsource_APPLE
- http://lists.manyfish.co.uk/pipermail/neon/2009-August/001044.html mailing-listx_refsource_MLIST
- http://lists.manyfish.co.uk/pipermail/neon/2009-August/001045.html mailing-listx_refsource_MLIST
- http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html vendor-advisoryx_refsource_SUSE
- http://rhn.redhat.com/errata/RHSA-2013-0131.html vendor-advisoryx_refsource_REDHAT
- http://secunia.com/advisories/36371 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://support.apple.com/kb/HT4435 x_refsource_CONFIRM
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:221 vendor-advisoryx_refsource_MANDRIVA
- http://www.vupen.com/english/advisories/2009/2341 vdb-entryx_refsource_VUPENPatchVendor Advisory
- https://access.redhat.com/security/cve/CVE-2009-2473 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=518215 Issue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/52633 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2009-2473
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9461 vdb-entrysignaturex_refsource_OVAL
- https://www.cve.org/CVERecord?id=CVE-2009-2473
- https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00924.html vendor-advisoryx_refsource_FEDORA
- https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00945.html vendor-advisoryx_refsource_FEDORA
Change history (0)
No recorded changes yet.