CVE-2018-25221 | Echatserver EChat Server 3.1 Username out-of-bounds write (Exploit 44155 / EUVD-2018-21700)

VDB-354079 · CVE-2018-25221 · EXPLOIT 44155 ECHATSERVER ECHAT SERVER 3.1 USERNAME OUT-OF-BOUNDS WRITE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 8.2 $0-$5k 2.31+ Summaryinfo A vulnerability was found in Echatserver EChat Server 3.1. It has been classified as critical. Affected by this vulnerability is an unknown functionality. This manipulation of the argument Username causes out-of-bounds write. The identification of this vulnerability is CVE-2018-25221. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. Detailsinfo A vulnerability classified as critical was found in Echatserver EChat Server 3.1. Affected by this vulnerability is an unknown code block. The manipulation of the argument username with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: EChat Server 3.1 contains a buffer overflow vulnerability in the chat.ghp endpoint that allows remote attackers to execute arbitrary code by supplying an oversized username parameter. Attackers can send a GET request to chat.ghp with a malicious username value containing shellcode and ROP gadgets to achieve code execution in the application context. It is possible to read the advisory at exploit-db.com. This vulnerability is known as CVE-2018-25221 since 03/28/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known. It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. The vulnerability is also documented in the databases at Exploit-DB (44155) and EUVD (EUVD-2018-21700). Productinfo Type Chat Software Vendor Echatserver Name EChat Server Version 3.1 CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 8.5 VulDB Meta Temp Score: 8.2 VulDB Base Score: 7.3 VulDB Temp Score: 6.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 9.8 CNA Vector (VulnCheck): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds write CWE: CWE-787 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 EPSS Score: 🔒 EPSS Percentile: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Exploit-DB: 🔒 Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/28/2026 Advisory disclosed 03/28/2026 +0 days CVE reserved 03/28/2026 +0 days VulDB entry created 03/28/2026 +0 days VulDB entry last update Sourcesinfo Advisory: 44155 Status: Not defined CVE: CVE-2018-25221 (🔒) GCVE (CVE): GCVE-0-2018-25221 GCVE (VulDB): GCVE-100-354079 EUVD: 🔒 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 03/28/2026 21:45 Updated: 03/28/2026 22:04 Changes: 03/28/2026 21:45 (81), 03/28/2026 22:04 (1) Complete: 🔍 Cache ID: 99:00C:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸