CVE-2026-20792

High

Published: 27 February 2026

Published

27 February 2026

Modified

05 March 2026

KEV Added

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Patch

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CVSS Score 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Score 0.0010 28.0th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-20792 is a high-severity Improper Restriction of Excessive Authentication Attempts (CWE-307) vulnerability in Chargemap Chargemap.Com. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Brute Force (T1110); ranked at the 28.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-7 (Unsuccessful Logon Attempts) and SC-5 (Denial-of-service Protection).

Threat & Defense at a Glance

What attackers do: exploitation maps to Brute Force (T1110) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

AC-7 Unsuccessful Logon Attempts good match

prevent

AC-7 enforces limits and lockouts on unsuccessful logon attempts, directly preventing brute-force attacks and resource exhaustion from unlimited authentication requests in the WebSocket API.

SC-5 Denial-of-service Protection good match

prevent

SC-5 implements denial-of-service protections like rate limiting, mitigating suppression or misrouting of legitimate charger telemetry via excessive authentication requests.

SI-4 System Monitoring partial match

detect

SI-4 monitors the system for indicators of excessive authentication attempts, enabling detection of brute-force or DoS exploitation in progress.

MITRE ATT&CK Enterprise TechniquesAI

T1110 Brute Force Credential Access

Adversaries may use brute force techniques to gain access to accounts when passwords are unknown or when password hashes are obtained.

attack.mitre.org →

T1499 Endpoint Denial of Service Impact

Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.

attack.mitre.org →

Why these techniques?

Missing rate limiting on auth requests directly enables brute-force credential access (T1110) and DoS via request flooding on the service endpoint (T1499).

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

NVD Description

The WebSocket Application Programming Interface lacks restrictions on the number of authentication requests. This absence of rate limiting may allow an attacker to conduct denial-of-service attacks by suppressing or misrouting legitimate charger telemetry, or conduct brute-force attacks to gain unauthorized…

access.

Deeper analysisAI

CVE-2026-20792 is a vulnerability in the WebSocket Application Programming Interface that lacks restrictions on the number of authentication requests due to the absence of rate limiting. Published on 2026-02-27, it is associated with systems handling charger telemetry and is documented in CISA's ICS advisory ICSA-26-057-05, ChargeMap support resources, and related CSAF files. The issue corresponds to CWE-307 (Improper Restriction of Excessive Authentication Attempts) and carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Remote attackers require no privileges or user interaction and can exploit the vulnerability over the network with low attack complexity. Successful exploitation enables denial-of-service attacks by suppressing or misrouting legitimate charger telemetry data, or brute-force attacks to gain unauthorized access to the system.

Mitigation details are provided in the referenced advisories, including CISA's ICSA-26-057-05 at https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-05, the corresponding CSAF JSON file at https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-05.json, and ChargeMap support at https://chargemap.com/en-us/support.