Description
strongSwan 4.5.x through 5.2.x before 5.2.1 allows remote attackers to cause a denial of service (invalid pointer dereference) via a crafted IKEv2 Key Exchange (KE) message with Diffie-Hellman (DH) group 1025.
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 | strongswan | 5.2.1-5 | — |
| Debian 13 | strongswan | 5.2.1-5 | — |
| Debian 12 | strongswan | 5.2.1-5 | — |
| Debian 7 | strongswan | 4.5.2-1.5+deb7u6 | DSA-3118-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | strongswan | 5.1.2-0ubuntu2.2 | USN-2450-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | strongswan | 5.1.3-9.1 | SUSE-SU-2015:0281-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | strongswan | 5.1.3-9.2 | SUSE-SU-2015:0281-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | strongswan | 5.3.5-1.1 | openSUSE-SU-2024:10579-1 |
Advisories 4
- DSA-3118-1 strongswan - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2450-1 strongswan vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2024:10579-1 strongswan-5.3.5-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:0281-1 Security update for strongswan SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 62095 third-party-advisory
- http://strongswan.org/blog/2015/01/05/strongswan-denial-of-service-vulnerability-%28cve-2014-9221%29.html
- USN-2450-1 vendor-advisory
- DSA-3118 vendor-advisory
- 62071 third-party-advisory
- FEDORA-2015-3043 vendor-advisory
- 62663 third-party-advisory
- openSUSE-SU-2015:0114 vendor-advisory
- http://strongswan.org/blog/2015/01/05/strongswan-5.2.2-released.html
- 62083 third-party-advisory
- 71894 vdb-entry