What is the CVSS score of CVE-2023-28356?

CVE-2023-28356 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.7%.

Rocket Chat CVE-2023-28356

HIGH

Uncontrolled Resource Consumption (CWE-400)

2023-05-11 support@hackerone.com

Denial Of Service Rocket Chat

7.5

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-400 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V2 - Validation and Business Logic Resource consumption limits MITRE ATT&CK 1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could cause denial of service by exhausting system resources by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.7% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

A vulnerability has been identified where a maliciously crafted message containing a specific chain of characters can cause the chat to enter a hot loop on one of the processes, consuming ~120% CPU. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement rate limiting, set resource quotas, validate input sizes, use timeouts.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Uncontrolled Resource Consumption (CWE-400), which allows attackers to cause denial of service by exhausting system resources. A vulnerability has been identified where a maliciously crafted message containing a specific chain of characters can cause the chat to enter a hot loop on one of the processes, consuming ~120% CPU and rendering the service unresponsive. Affected products include: Rocket.Chat.

Know when Rocket Chat gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

Threat Intelligence Overview

EPSS Score

0.7%

Top 50% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.7%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:a:rocket.chat:rocket.chat:*:*:*:*:*:*:*:*

More in Rocket Chat

View all

CVE-2021-22910 CRITICAL Act Now POC

9.8 Aug 09

A sanitization vulnerability exists in Rocket.Chat server versions <3.13.2, <3.12.4, <3.11.4 that allowed queries to an

CVE-2021-22911 CRITICAL Act Now POC

9.8 May 27

A improper input sanitization vulnerability exists in Rocket.Chat server 3.11, 3.12 & 3.13 that could lead to unauthenti

CVE-2022-35248 HIGH This Week POC

8.8 Sep 23

A improper authentication vulnerability exists in Rocket.Chat <v5, <v4.8.2 and <v4.7.5 that allowed two factor authentic

CVE-2022-32211 HIGH This Week POC

8.8 Sep 23

A SQL injection vulnerability exists in Rocket.Chat <v3.18.6, <v4.4.4 and <v4.7.3 which can allow an attacker to retriev

CVE-2024-39713 HIGH This Week POC

8.6 Aug 05

A Server-Side Request Forgery (SSRF) affects Rocket.Chat's Twilio webhook endpoint before version 6.10.1. Rated high sev

CVE-2026-23477 HIGH This Week POC

7.7 Jan 14

Rocket.Chat versions prior to 6.12.0 expose the OAuth applications API endpoint to any authenticated user, allowing disc

CVE-2021-22892 HIGH This Week POC

7.5 May 27

An information disclosure vulnerability exists in the Rocket.Chat server fixed v3.13, v3.12.2 & v3.11.3 that allowed ema

CVE-2022-30124 MEDIUM This Month POC

6.8 Sep 23

An improper authentication vulnerability exists in Rocket.Chat Mobile App <4.14.1.22788 that allowed an attacker with ph

CVE-2022-32227 MEDIUM This Month POC

6.5 Sep 23

A cleartext transmission of sensitive information exists in Rocket.Chat <v5, <v4.8.2 and <v4.7.5 relating to Oauth token

CVE-2022-32220 MEDIUM This Month POC

6.5 Sep 23

An information disclosure vulnerability exists in Rocket.Chat <v5 due to the getUserMentionsByChannel meteor server meth

CVE-2021-32832 MEDIUM This Month POC

6.5 Aug 30

Rocket.Chat is an open-source fully customizable communications platform developed in JavaScript. Rated medium severity

CVE-2022-21830 MEDIUM This Month POC

6.1 Apr 01

A blind self XSS vulnerability exists in RocketChat LiveChat <v1.9 that could allow an attacker to trick a victim pastin

Same weakness CWE-400 – Uncontrolled Resource Consumption

View all

CVE-2023-44487 HIGH POC

7.5

CVE-2021-21341 HIGH POC

7.5

CVE-2022-29885 HIGH POC

7.5

CVE-2026-45498 HIGH POC

7.5

CVE-2016-8610 HIGH

7.5

CVE-2026-28318 HIGH POC

7.5

CVE-2023-38180 HIGH

7.5

CVE-2025-26673 HIGH

7.5

Same technique Denial Of Service

View all

CVE-2015-5119 CRITICAL POC

9.8

CVE-2011-2462 CRITICAL POC

9.8

CVE-2011-0611 HIGH POC

8.8

CVE-2012-1889 HIGH POC

8.8

CVE-2012-0507 CRITICAL POC

9.8

CVE-2014-1761 HIGH POC

7.8

CVE-2015-5122 CRITICAL POC

9.8

CVE-2011-0609 HIGH POC

7.8

References

Advisories & patches

REF https://hackerone.com/reports/1461340

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back