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HIGH

CVE-2026-63090

CVSS v3

8.8

HIGH

EPSS Score

0.5 %

exploit probability

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

ProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the mod_sftp module that allows authenticated low-privilege attackers to achieve arbitrary code execution by sending crafted SFTP packet fragments exceeding the 16 KB reassembly buffer in the fxp.c component. Attackers can supply oversized fragments to trigger an incorrectly conditioned reallocation, corrupt pool freelist metadata, overwrite the root_fs BSS global pointer to reference a fake filesystem str

Technical details

CVSS v3 Vector
3.1
Published
2026-07-20
Last Modified
2026-07-21

Frequently asked questions

What is CVE-2026-63090?

ProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the mod_sftp module that allows authenticated low-privilege attackers to achieve arbitrary code execution by sending crafted SFTP packet fragments exceeding the 16 KB reassembly buffer in the fxp.c component. Attackers can supply oversized fragments to trigger an incorrectly conditioned reallocation, corrupt pool freelist metadata, overwrite the root_fs BSS global pointer to reference a fake filesystem str

Is CVE-2026-63090 actively exploited?

Active exploitation of CVE-2026-63090 has not been confirmed. The EPSS score is 0.5%, indicating the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-63090?

CVE-2026-63090 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string 3.1.

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