CVE•Published 2026-07-20•Modified 2026-07-30•1 article on news•6 live references•NVD data

CVE-2026-63090Proftpd · Proftpd

Vulnerability data via NVD (ingested)

CVSS v3.1

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 62% of all CVEs

Weaknesses (CWE)

CWE-122Heap-based Buffer Overflow

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 struct, and redirect pr_fsio_stat() to system() via a crafted RENAME request.

Timeline

Published 2026-07-20

Modified 2026-07-30

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag39,047 hosts

vuln:CVE-2026-63090

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Proftpd Proftpd"

All exposed Proftpd Proftpd instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Proftpd"

HTTP body or banner mentions "Proftpd" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-63090