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CVE-2026-25075— strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow

Quick assessment

Affected
strongSwan strongSwan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

strongSwan是瑞士Andreas Steffen个人开发者的一套Linux平台使用的开源的基于IPsec的VPN解决方案。该方案包含X.509公开密钥证书、安全储存私钥、智能卡等认证机制。 strongSwan 6.0.5之前版本存在代码问题漏洞，该漏洞源于EAP-TTLS AVP解析器存在整数下溢，可能导致未经身份验证的远程攻击者通过发送具有无效长度字段的特制AVP数据来造成拒绝服务。

CVSS 7.5 · High EPSS 1.01% · P60

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
strongSwan strongSwan 4.5.0< 6.0.5 affected
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I. Basic Information for CVE-2026-25075

Vulnerability Information
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Vulnerability Title
strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow
Source: CVE Program / CVE List V5
Vulnerability Description
strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
strongSwan 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
strongSwan是瑞士Andreas Steffen个人开发者的一套Linux平台使用的开源的基于IPsec的VPN解决方案。该方案包含X.509公开密钥证书、安全储存私钥、智能卡等认证机制。 strongSwan 6.0.5之前版本存在代码问题漏洞，该漏洞源于EAP-TTLS AVP解析器存在整数下溢，可能导致未经身份验证的远程攻击者通过发送具有无效长度字段的特制AVP数据来造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
strongSwan strongSwan 4.5.0 ~ 6.0.5 -

II. Public POCs for CVE-2026-25075

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III. Intelligence Information for CVE-2026-25075

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Vendor Advisories for CVE-2026-25075 (1)

Security Blog Posts for CVE-2026-25075 (3)

IV. Related Vulnerabilities

Same product: strongSwan
Same vendor: strongSwan
Same weakness: CWE-191

V. Comments for CVE-2026-25075

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