Cyber Resilience

CVE-2019-25613

Echatserver Easy Chat Server 3.1

Public PoC
Published
22 March 2026
Modified
02 April 2026
CVSS Score v4 8.7
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0052 43th percentile
Risk Priority 45 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2019-25613 is a high-severity Improper Verification of Source of a Communication Channel (CWE-940) vulnerability in Echatserver Easy Chat Server. Its CVSS base score is 8.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Adversary-in-the-Middle (T1557); ranked at the 43th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to AC-17 (Remote Access) and IA-3 (Device Identification and Authentication) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2019-25613 is a denial of service vulnerability affecting Easy Chat Server 3.1. The flaw arises from the application's failure to properly handle oversized data in the message parameter, classified under CWE-940. It enables remote attackers to crash the server, as indicated by its CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), emphasizing high availability impact with network accessibility and no authentication required.

Any remote attacker can exploit this vulnerability without privileges. The attack begins by establishing a session through the chat.ghp endpoint, followed by sending a POST request to body2.ghp containing an excessively large message parameter value. This triggers the service to crash, disrupting availability for all users.

Reference advisories include a VulnCheck report detailing the denial of service via the message parameter and a proof-of-concept exploit published on Exploit-DB (ID 46806). Vendor resources are available at echatserver.com, including the ecssetup.exe download, though no specific patch details are outlined in the provided information.

OWASP Top 10 for Web (2025)

A07:2025 Authentication Failures

EU & UK References

Vulnerability Data

Easy Chat Server 3.1 contains a denial of service vulnerability that allows remote attackers to crash the application by sending oversized data in the message parameter. Attackers can establish a session via the chat.ghp endpoint and then send a POST…

more

request to body2.ghp with an excessively large message parameter value to cause the service to crash.

CWE(s)
CWE-940

Related Threats

MITRE ATT&CK Enterprise Techniques

T1557 Adversary-in-the-Middle Credential Access
Adversaries may attempt to position themselves between two or more networked devices using an adversary-in-the-middle (AiTM) technique to support follow-on behaviors such as [Network Sniffing](https://attack.
attack.mitre.org →
T1557.001 Name Resolution Poisoning and SMB Relay Credential Access
By responding to LLMNR/NBT-NS/mDNS network traffic, adversaries may spoof an authoritative source for name resolution to force communication with an adversary controlled system.
attack.mitre.org →
T1557.002 ARP Cache Poisoning Credential Access
Adversaries may poison Address Resolution Protocol (ARP) caches to position themselves between the communication of two or more networked devices.
attack.mitre.org →
T1557.003 DHCP Spoofing Credential Access
Adversaries may redirect network traffic to adversary-owned systems by spoofing Dynamic Host Configuration Protocol (DHCP) traffic and acting as a malicious DHCP server on the victim network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2018-25221Same product: Echatserver Easy Chat Server
CVE-2026-35643Shared CWE-940
CVE-2026-40434Shared CWE-940
CVE-2026-54106Shared CWE-940
CVE-2026-78685Shared CWE-940
CVE-2024-20390Shared CWE-940
CVE-2026-48745Shared CWE-940
CVE-2024-40515Shared CWE-940
CVE-2024-7322Shared CWE-940
CVE-2026-85085Shared CWE-940

Affected Assets

echatserver
easy chat server
3.1

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V3.5.3
  • V10.6.2
  • V15.2.4

Mitigating Controls (NIST 800-53 r5) AI

IA-3 Device Identification and Authentication good match

IA-3 requires unique identification and authentication of devices before any communication channel is established, directly stopping acceptance of unverified origins.

AC-17 Remote Access good match

AC-17 mandates documented restrictions and authentication requirements for remote access, blocking channels whose origins are not properly verified.

SC-23 Session Authenticity partial match

SC-23 protects session authenticity, ensuring the source of an established communication channel is verified and cannot be spoofed.

SC-7 Boundary Protection partial match

SC-7 enforces monitoring and control at external and key internal interfaces, preventing channels from unverified sources via boundary rules.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-03 partial match
prevents

Authentication of users/services/hardware directly enforces source verification for communication channels.

PR.AA-04 partial match
prevents

Verifying identity assertions prevents spoofed channel origins but does not cover all channel-establishment scenarios.

PR.IR-01 partial match
prevents

Network protections reduce unauthorized channel usage but do not specifically require origin verification at channel setup.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.20 Networks security partial match
degrades

Network security controls enforce source verification and channel authentication for incoming communications.

A.8.21 Security of network services partial match
degrades

Security of network services includes validating the origin of service requests and connections.

A.8.22 Segregation of networks partial match
mitigates

Network segregation limits exposure but does not directly verify source of individual channels.

A.8.24 Use of cryptography partial match
prevents

Cryptography can support channel authentication but does not inherently verify source without proper implementation.

A.8.26 Application security requirements partial match
prevents

Application security requirements may specify origin checks but do not mandate them.

A.8.28 Secure coding partial match
prevents

Secure coding practices can prevent improper source verification if explicitly required.

References