Description
In stroke_socket.c in strongSwan before 5.6.3, a missing packet length check could allow a buffer underflow, which may lead to resource exhaustion and denial of service while reading from the socket.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| strongSwan | strongSwan | 5.6.3 – < 5.6.3 | 5.6.3 |
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 | 5.6.3-1 | — |
| Debian 13 | strongswan | 5.6.3-1 | — |
| Debian 12 | strongswan | 5.6.3-1 | — |
| Debian 9 | strongswan | 5.5.1-4+deb9u2 | DSA-4229-1 |
| Debian 8 | strongswan | 5.2.1-6+deb8u6 | DSA-4229-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | strongswan | 5.6.2-1ubuntu2.2 | USN-3771-1 |
| Ubuntu 16.04 LTS | strongswan | 5.3.5-1ubuntu3.7 | USN-3771-1 |
| Ubuntu 14.04 LTS | strongswan | 5.1.2-0ubuntu2.10 | USN-3771-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | strongswan | 5.6.0-4.3.2 | SUSE-SU-2019:3056-1 |
| SLES 15 | strongswan | 5.6.0-4.3.2 | SUSE-SU-2019:3056-1 |
| SLES 12 SP5 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SLES 12 SP4 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SLES 12 SP3 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SLES 12 SP1 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SLES for SAP 12 SP5 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SLES for SAP 12 SP4 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SLES for SAP 12 SP3 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SLES for SAP 12 SP2 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SLES for SAP 12 SP1 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SUSE OpenStack Cloud 8 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SUSE OpenStack Cloud 7 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
| SUSE Enterprise Storage 5 | strongswan | 5.1.3-26.13.1 | SUSE-SU-2019:3266-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | strongswan | 5.9.0-1.9 | openSUSE-SU-2024:11411-1 |
| openSUSE Leap 15.1 | strongswan | 5.6.0-lp151.4.3.1 | openSUSE-SU-2019:2598-1 |
| openSUSE Leap 15.0 | strongswan | 5.6.0-lp150.3.3.1 | openSUSE-SU-2019:2594-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | strongswan | 5.6.3-r0 | — |
| Alpine v3.23 | strongswan | 5.6.3-r0 | — |
| Alpine v3.22 | strongswan | 5.6.3-r0 | — |
| Alpine v3.21 | strongswan | 5.6.3-r0 | — |
| Alpine v3.20 | strongswan | 5.6.3-r0 | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | strongswan | 5.6.3-r0 | — |
| Alpine v3.18 | strongswan | 5.6.3-r0 | — |
| Alpine v3.17 | strongswan | 5.6.3-r0 | — |
| Alpine v3.16 | strongswan | 5.6.3-r0 | — |
| Alpine v3.15 | strongswan | 5.6.3-r0 | — |
| Alpine v3.14 | strongswan | 5.6.3-r0 | — |
| Alpine v3.13 | strongswan | 5.6.3-r0 | — |
| Alpine v3.12 | strongswan | 5.6.3-r0 | — |
| Alpine v3.11 | strongswan | 5.6.3-r0 | — |
| Alpine v3.10 | strongswan | 5.6.3-r0 | — |
| Alpine v3.9 | strongswan | 5.6.3-r0 | — |
| Alpine v3.8 | strongswan | 5.6.3-r0 | — |
| Alpine v3.7 | strongswan | 5.6.3-r0 | — |
Advisories 9
- DSA-4229-1 strongswan - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3771-1 strongswan vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2019:2598-1 Security update for strongswan SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3056-1 Security update for strongswan SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2594-1 Security update for strongswan SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11411-1 strongswan-5.9.0-1.9 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3266-1 Security update for strongswan SUSE / openSUSE Security Updates · Feb 4, 2026
- VDE-2019-009 PHOENIX CONTACT: Multiple Vulnerabilities in AXC F 2152 CERT@VDE · May 22, 2025
- ICSA-19-155-01 PHOENIX CONTACT PLCNext AXC F 2152 CISA ICS & IT advisories · Jun 4, 2019
References
- VU#338343 third-party-advisory
- GLSA-201811-16 vendor-advisory
- https://git.strongswan.org/?p=strongswan.git%3Ba=commitdiff%3Bh=0acd1ab4
- 104263 vdb-entry
- USN-3771-1 vendor-advisory
- DSA-4229 vendor-advisory
- openSUSE-SU-2019:2594 vendor-advisory
- openSUSE-SU-2019:2598 vendor-advisory
- openSUSE-SU-2020:0403 vendor-advisory
- http://packetstormsecurity.com/files/172833/strongSwan-VPN-Charon-Server-Buffer-Overflow.html