Description
ssl/s3_pkt.c in OpenSSL before 0.9.8i allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a DTLS ChangeCipherSpec packet that occurs before ClientHello.
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 | openssl | 0.9.8k-1 | — |
| Debian 13 | openssl | 0.9.8k-1 | — |
| Debian 12 | openssl | 0.9.8k-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | openssl +2 | 0.9.8e-12.el5 | RHSA-2009:1335 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openssl-1_1 | 1.1.1l-1.2 | openSUSE-SU-2024:11127-1 |
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.
Metasploit 1 module
-
OpenSSL DTLS ChangeCipherSpec Remote DoS
auxiliary/dos/ssl/dtls_changecipherspec
Exploit-DB 1
- OpenSSL < 0.9.8i - DTLS ChangeCipherSpec Remote Denial of Service EDB-8873 · dos · Jun 4, 2009 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- RHSA-2009:1335 Red Hat Security Advisory: openssl security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- openSUSE-SU-2024:11127-1 libopenssl-1_1-devel-1.1.1l-1.2 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- 38794 third-party-advisory
- [security-announce] 20100303 VMSA-2010-0004 ESX Service Console and vMA third party updates mailing-list
- 35729 third-party-advisory
- http://cvs.openssl.org/chngview?cn=17369
- [oss-security] 20090602 Re: Two OpenSSL DTLS remote DoS mailing-list
- RHSA-2009:1335 vendor-advisory
- HPSBMA02492 vendor-advisory
- 36533 third-party-advisory
- oval:org.mitre.oval:def:11179 vdb-entry signature
- USN-792-1 vendor-advisory
- oval:org.mitre.oval:def:7469 vdb-entry signature
- http://rt.openssl.org/Ticket/Display.html?id=1679&user=guest&pass=guest
- 38834 third-party-advisory
- openssl-changecipherspec-dos(50963) vdb-entry
- 35685 third-party-advisory
- 8873 exploit
- 35571 third-party-advisory
- SUSE-SR:2009:012 vendor-advisory
- 35174 vdb-entry
- ADV-2010-0528 vdb-entry