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CVE-2026-119567— vsftpd through 3.0.5 cmds_denied Bypass via RFC 775 Command Aliases

Quick assessment

Affected
vsftpd vsftpd
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.

vsftpd 3.0.5 及之前版本中存在一个访问控制绕过漏洞。已认证的 FTP 用户可以通过发送以 RFC 775 定义的 X-前缀别名，执行被禁止的命令。由于 process_post_login() 函数中的 cmds_denied 检查仅进行字面令牌比较，攻击者可以发送 XRMD、XMKD、XCWD、XPWD 或 XCUP 等命令，从而执行如删除目录等已被阻止的操作。

CVSS 3.1 · Low

Affected Version Matrix 1

VendorProduct Version RangeStatus
vsftpd vsftpd ≤ 3.0.5 affected
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I. Basic Information for CVE-2026-119567

Vulnerability Information
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Vulnerability Title
vsftpd through 3.0.5 cmds_denied Bypass via RFC 775 Command Aliases
Source: CVE Program / CVE List V5
Vulnerability Description
vsftpd through 3.0.5 contains an access control bypass vulnerability that allows authenticated FTP users to execute denied commands by issuing RFC 775 X-prefixed aliases. The cmds_denied check in process_post_login() compares literal tokens, so attackers can send XRMD, XMKD, XCWD, XPWD, or XCUP to perform blocked operations like deleting directories.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vsftpd vsftpd 0 ~ 3.0.5 -

II. Public POCs for CVE-2026-119567

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III. Intelligence Information for CVE-2026-119567

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Vendor Advisories for CVE-2026-119567 (1)

Security Blog Posts for CVE-2026-119567 (1)

Vendor Pages for CVE-2026-119567 (1)

IV. Related Vulnerabilities

Same product: vsftpd
Same vendor: vsftpd
Same weakness: CWE-184