neon 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
neon 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 (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.
- Published
- Aug 21, 2009
- Updated
- Jun 16, 2026
- EPSS
- 1.5% · 73th percentile
- CWE
- CWE-326
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Report tools
Action score
23
Monitor
Low priority for now.
- CVSS
- 23 / 40 · 5.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.5%
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| webdav | neon | cpe:2.3:a:webdav:neon |
| apple | mac os x | cpe:2.3:o:apple:mac_os_x |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apple mac os xbefore 10.6.5
- canonical ubuntu linux6.06
- canonical ubuntu linux8.04
- canonical ubuntu linux8.10
- canonical ubuntu linux9.04
- fedoraproject fedora10
- fedoraproject fedora11
- webdav neonbefore 0.28.6
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | litmus | before 0.13-1 | 0.13-1 |
| Debian:12 | neon27 | before 0.28.6-1 | 0.28.6-1 |
| Red Hat:enterprise_linux:4::as | neon | before 0:0.24.7-4.el4_8.2 | 0:0.24.7-4.el4_8.2 |
| Red Hat:enterprise_linux:4::as | neon-debuginfo | before 0:0.24.7-4.el4_8.2 | 0:0.24.7-4.el4_8.2 |
| Red Hat:enterprise_linux:4::as | neon-devel | before 0:0.24.7-4.el4_8.2 | 0:0.24.7-4.el4_8.2 |
| Red Hat:enterprise_linux:5::client_workstation | neon | before 0:0.25.5-10.el5_4.1 | 0:0.25.5-10.el5_4.1 |
| Red Hat:enterprise_linux:5::client_workstation | neon-debuginfo | before 0:0.25.5-10.el5_4.1 | 0:0.25.5-10.el5_4.1 |
| Red Hat:enterprise_linux:5::client_workstation | neon-devel | before 0:0.25.5-10.el5_4.1 | 0:0.25.5-10.el5_4.1 |
Same product
webdav: all recordsOther 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) Subversio30Monitor
- CVE-2009-2473neon before 0.28.6, when expat is used, does not properly detect recursion during entity expansion, which allows context-dependent attackers20Monitor
- 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 Di18Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:litmus | 0.13-1 · Debian:12 | Package registry (OSV) |
| debian:neon27 | 0.28.6-1 · Debian:12 | Package registry (OSV) |
| red hat:neon | 0:0.24.7-4.el4_8.2 · Red Hat:enterprise_linux:4::as | Package registry (OSV) |
| red hat:neon-debuginfo | 0:0.24.7-4.el4_8.2 · Red Hat:enterprise_linux:4::as | Package registry (OSV) |
| red hat:neon-devel | 0:0.24.7-4.el4_8.2 · Red Hat:enterprise_linux:4::as | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
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 researchersFinders, 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
- P · data can be read
- Integrity
- P · data or configuration can be modified
- Availability
- none
- Attack complexity
- M
- Confidentiality impact
- P
- Integrity impact
- P
- Availability impact
- None
Weakness class (CWE)
CWE-326 · Inadequate Encryption StrengthCVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:N
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.
Attack patterns (CAPEC)
ATT&CK techniques
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.apple.com/archives/security-announce/2010//Nov/msg00000.html
- lists.manyfish.co.uk/pipermail/neon/2009-August/001044.html
- lists.manyfish.co.uk/pipermail/neon/2009-August/001046.html
- secunia.com/advisories/36371
- secunia.com/advisories/36799
- support.apple.com/kb/HT4435
- www.mandriva.com/security/advisories?name=MDVSA-2009:221
- www.securityfocus.com/bid/36079
- www.ubuntu.com/usn/usn-835-1
- www.vupen.com/english/advisories/2009/2341
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11721
- www.redhat.com/archives/fedora-package-announce/2009-August/msg00924.html
- www.redhat.com/archives/fedora-package-announce/2009-August/msg00945.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.