CVE-2026-63090 (GCVE-0-2026-63090)

Vulnerability from cvelistv5 – Published: 2026-07-20 14:22 – Updated: 2026-07-28 01:49 X_Open Source
VLAI
Title
ProFTPD mod_sftp Heap Buffer Overflow via SFTP Packet Reassembly
Summary
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.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-21 15:33 UTC
CWE
  • CWE-122 - Heap-based Buffer Overflow
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6503 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
proftpd proftpd Affected: 0 , < 1.3.9c (custom)
Affected: 1.3.10rc1 , < 1.3.10rc3 (custom)
    cpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*
    cpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-06-26 00:00
Credits
Fabian Wahle with Hap Security
Show details on NVD website
To clipboard 

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              "url": "https://github.com/proftpd/proftpd/releases/tag/v1.3.10rc3-3"
            },
            {
              "name": "ProFTPD 1.3.9c Release Notes",
              "tags": [
                "patch",
                "release-notes"
              ],
              "url": "https://github.com/proftpd/proftpd/releases/tag/v1.3.9c"
            },
            {
              "name": "Pull Request",
              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/proftpd/proftpd/issues/2190"
            },
            {
              "name": "Patch Commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/proftpd/proftpd/commit/4ee8701bcf425f11b3b2116e634ff3e655d918b1"
            },
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.vulncheck.com/advisories/proftpd-mod-sftp-heap-buffer-overflow-via-sftp-packet-reassembly"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "tags": [
            "x_open-source"
          ],
          "title": "ProFTPD mod_sftp Heap Buffer Overflow via SFTP Packet Reassembly",
          "x_generator": {
            "engine": "vulncheck"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2026-63090",
        "datePublished": "2026-07-20T14:22:03.712Z",
        "dateReserved": "2026-07-15T15:45:44.600Z",
        "dateUpdated": "2026-07-28T01:49:57.243Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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