How severe is CVE-2019-25686?

CVE-2019-25686 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-25686 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-25686?

CVE-2019-25686 affects Coreftp Core Ftp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-25686?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2019-25686 have an EU (EUVD) identifier?

Yes. CVE-2019-25686 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-20105.

When was CVE-2019-25686 published?

CVE-2019-25686 was published on 2026-04-05 and last updated on 2026-06-17.

CVE-2019-25686

CVE-2019-25686 is a high-severity vulnerability in Coreftp Core Ftp with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2019-20105
Weakness: CWE-306
Affected product: Coreftp Core Ftp
Published: 2026-04-05
Last modified: 2026-06-17

Description

Core FTP 2.0 build 653 contains a denial of service vulnerability in the PBSZ command that allows unauthenticated attackers to crash the service by sending a malformed command with an oversized buffer. Attackers can send a PBSZ command with a payload exceeding 211 bytes to trigger an access violation and crash the FTP server process.

Frequently asked questions

What is CVE-2019-25686?: Core FTP 2.0 build 653 contains a denial of service vulnerability in the PBSZ command that allows unauthenticated attackers to crash the service by sending a malformed command with an oversized buffer. Attackers can send a PBSZ command with a payload exceeding 211 bytes to trigger an access violation and crash the FTP server process.
How severe is CVE-2019-25686?: CVE-2019-25686 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-25686 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-25686?: CVE-2019-25686 affects Coreftp Core Ftp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-25686?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2019-25686 have an EU (EUVD) identifier?: Yes. CVE-2019-25686 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-20105.
When was CVE-2019-25686 published?: CVE-2019-25686 was published on 2026-04-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:coreftp:core_ftp:2.0:build_653:*:*:*:*:*:*

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CVE-2020-19596 — Critical (CVSS 9.8): Buffer overflow vulnerability in Core FTP Server v1.2 Build 583, via a crafted username.
CVE-2018-12113 — Critical (CVSS 9.8): Core FTP LE version 2.2 Build 1921 is prone to a buffer overflow vulnerability that may result in a DoS or remote code…
CVE-2013-3930 — Critical (CVSS 9.3): Stack-based buffer overflow in Core FTP before 2.2 build 1785 allows remote FTP servers to execute arbitrary code via a…
CVE-2009-3484 — Critical (CVSS 9.3): Stack-based buffer overflow in Core FTP 2.1 build 1612 allows user-assisted remote attackers to execute arbitrary code…
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