CVE-2019-25590Public exploit

Client crash via oversized logging filename

Published Mar 22, 2026 · Updated Mar 22, 2026

Denial of service in LabF Axessh 4.2 allows local users to crash the client through an oversized logging filename. The logging dialog accepts at least 500 characters in the Log file name field without rejecting its length, then processes the value when a Telnet connection starts. The user must enable session logging, paste the oversized value locally, and start the connection; the demonstrated consequence is an application crash.

CVSS severity6.9
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in LabF Axessh 4.2 allows local users to crash the client through an oversized logging filename. The logging dialog accepts at least 500 characters in the Log file name field without rejecting its length, then processes the value when a Telnet connection starts. The user must enable session logging, paste the oversized value locally, and start the connection; the demonstrated consequence is an application crash.

The record

CVE
CVE-2019-25590
Published
Mar 22, 2026
Updated
Mar 22, 2026
Vendor
LabF
Product
Axessh
Classifications
CWE-1282, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

LabF · Axesshversion=4.2

Published CVSS scores

6.2VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
6.9VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1282Assumed-Immutable Data is Stored in Writable Memory
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo