TI-2023-11610 Aliases CVE-2023-26463 GHSA-vcx9-7pcc-q8c7

strongSwan 5.9.8 and 5.9.9 potentially allows remote code execution because it uses a…

MEDIUM 46CWE-295Published 2023-04-14 · Updated 2025-02-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Spoofing, Denial of service
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-295 and CWE-476.

Summary

strongSwan 5.9.8 and 5.9.9 potentially allows remote code execution because it uses a variable named "public" for two different purposes within the same function. There is initially incorrect access control, later followed by an expired pointer dereference. One attack vector is sending an untrusted client certificate during EAP-TLS. A server is affected only if it loads plugins that implement TLS-based EAP methods (EAP-TLS, EAP-TTLS, EAP-PEAP, or EAP-TNC). This is fixed in 5.9.10.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.02264 83rd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	—	—	No fix listed	CNA

— Vendor— Affected — Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:strongswan:strongswan:5.9.8:-::::::	5.9.8	Vulnerable	strongSwan
cpe:2.3:a:strongswan:strongswan:5.9.9:-::::::	5.9.9	Vulnerable	strongSwan

cpe:2.3:a:strongswan:strongswan:5.9.8:-:*:*:*:*:*:* Versions 5.9.8 Vulnerable ·strongSwan
cpe:2.3:a:strongswan:strongswan:5.9.9:-:*:*:*:*:*:* Versions 5.9.9 Vulnerable ·strongSwan

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2023-26463
2026-10-03 Alias added: GHSA-vcx9-7pcc-q8c7

References

Advisory 1

https://www.strongswan.org/blog/2023/03/02/strongswan-vulnerability-%28cve-2023-26463%29.html

Other 2

TI-2023-22300 strongSwan before 5.9.12 has a buffer overflow and possible unauthenticated remote code… CVSS 3.1CRITICAL 9.8
TI-2015-03374 strongSwan 5.2.2 and 5.3.0 allows remote attackers to cause a denial of service (daemon… CVSS 3.0CRITICAL 9.8
TI-2004-00531 FreeS/WAN 1.x and 2.x, and other related products including superfreeswan 1.x, openswan… CVSS 2.0HIGH 10.0
TI-2021-20414 In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too… CVSS 3.1CRITICAL 9.1
TI-2017-08240 The gmp plugin in strongSwan before 5.6.0 allows remote attackers to cause a denial of… CVSS 3.1HIGH 7.5
TI-2021-18520 The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted… CVSS 3.1HIGH 7.5

See all 47 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences