[NEW] [medium] ProFTPD: Vulnerability allows denial of service

mediumCVE-2026-53994

A remote, authenticated attacker can exploit a vulnerability in ProFTPD to carry out a denial of service attack.

CSIRTS triage

vendor: ProFTPD product: ProFTPD Denial of service

What: A vulnerability allows a remote authenticated attacker to carry out a denial of service attack.
Who is affected: Remote authenticated attackers targeting ProFTPD installations.
Urgency: Remediation is medium urgency due to the potential for service disruption.
Action: Update ProFTPD to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-20
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2406

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-539940.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53994	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highCVE-2026-53994: ProFTPD mod_sftp contains a heap-based buffer overflow reachable by an authenticated SFTP user…nvd

Recent advisories for ProFTPD

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[UPDATE] [high] ProFTPD: Vulnerability allows SQL injectioncert-bund · 2026-07-27
high[UPDATE] [high] ProFTPD: Vulnerability allows bypassing security measures and file manipulationcert-bund · 2026-07-22
high[NEW] [high] ProFTPD: Multiple vulnerabilitiescert-bund · 2026-07-21
mediumCVE-2026-63091: ProFTPD before 1.3.9c and 1.3.10rc3 contains a signed integer overflow vulnerability in the mo…nvd · 2026-07-20
highCVE-2026-63090: ProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the…nvd · 2026-07-20
highCVE-2026-53994: ProFTPD mod_sftp contains a heap-based buffer overflow reachable by an authenticated SFTP user…nvd · 2026-07-18