Description
liblber/io.c in OpenLDAP 2.2.4 to 2.4.10 allows remote attackers to cause a denial of service (program termination) via crafted ASN.1 BER datagrams that trigger an assertion error.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openldap | 2.4.10-3 | — |
| Debian 13 | openldap | 2.4.10-3 | — |
| Debian 12 | openldap | 2.4.10-3 | — |
| Debian 5.0 | openldap | 2.4.10-2+lenny1 | DTSA-151-1 |
| Debian 4.0 | openldap2.3 | 2.3.30-5+etch2 | DSA-1650-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | compat-openldap | 2.3.27_2.2.29-8.el5_2.4 | RHSA-2008:0583 |
| RHEL 5 | openldap +4 | 2.3.27-8.el5_2.4 | RHSA-2008:0583 |
| RHEL 4 | compat-openldap | 2.1.30-8.el4_6.5 | RHSA-2008:0583 |
| RHEL 4 | openldap +4 | 2.2.13-8.el4_6.5 | RHSA-2008:0583 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- OpenLDAP 2.3.41 - BER Decoding Remote Denial of Service EDB-32000 · dos · Jun 30, 2008 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- RHSA-2008:0583 Red Hat Security Advisory: openldap security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1650-1 openldap2.3 - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
- DTSA-151-1 openldap - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
References
- RHSA-2008:0583 vendor-advisory
- GLSA-200808-09 vendor-advisory
- 31364 third-party-advisory
- oval:org.mitre.oval:def:10662 vdb-entry signature
- 30917 third-party-advisory
- APPLE-SA-2008-07-31 vendor-advisory
- openldap-bergetnext-dos(43515) vdb-entry
- http://www.openldap.org/its/index.cgi/Software%20Bugs?id=5580%3Bselectid=5580
- DSA-1650 vendor-advisory
- 30013 vdb-entry
- [oss-security 20080701 Re: [oss-security] openldap DoS mailing-list
- ADV-2008-2268 vdb-entry
- 20080811 rPSA-2008-0249-1 openldap openldap-clients openldap-servers mailing-list
- https://issues.rpath.com/browse/RPL-2645
- 30996 third-party-advisory
- 31436 third-party-advisory
- SUSE-SR:2008:021 vendor-advisory
- MDVSA-2008:144 vendor-advisory
- [oss-security] 20080713 Re: openldap DoS mailing-list
- USN-634-1 vendor-advisory
- http://www.zerodayinitiative.com/advisories/ZDI-08-052/
- 30853 third-party-advisory
- http://wiki.rpath.com/Advisories:rPSA-2008-0249
- 31326 third-party-advisory
- FEDORA-2008-6062 vendor-advisory
- 32254 third-party-advisory
- 1020405 vdb-entry
- ADV-2008-1978 vdb-entry
- http://www.openldap.org/its/index.cgi/Software%20Bugs?id=5580
- FEDORA-2008-6029 vendor-advisory
- 32316 third-party-advisory