Apache Struts 2.1.8 <= 2.3.37 / 2.5.x <= 2.5.33 / 6.x < 6.12.0 / 7.x < 7.4.0 Denial of Service (S2-077)

medium Nessus Plugin ID 364468

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Synopsis

The Apache Struts install on the remote host is affected by a denial of service vulnerability.

Description

The version of Apache Struts installed on the remote host is 2.1.8 through 2.3.37, or 2.5.0 through 2.5.33, or 6.x prior to 6.12.0, or 7.x prior to 7.4.0. It is, therefore, affected by a denial of service vulnerability, as referenced in the S2-077 advisory:

- Allocation of resources without limits or throttling vulnerability in the Apache Struts REST plugin. A request body is read into memory without any bound on how much will be accepted, so a single request can cause the server to allocate memory in proportion to its size, exhausting the Java heap and denying service to other users. No additional setting has to be enabled. Applications that do not use the REST plugin are not affected.
(CVE-2026-104713)

Nessus cannot verify whether the application uses the REST plugin, so this finding is flagged as a potential vulnerability.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Apache Struts version 6.12.0 / 7.4.0 or later. Alternatively, apply the workaround as referenced in the vendor's security bulletin.

Plugin Details

Severity: Medium

ID: 364468

File Name: struts_S2-077.nasl

Version: 1.2

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 10/9/2026

Updated: 10/12/2026

Configuration: Enable paranoid mode, Enable thorough checks (optional)

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:apache:struts

Required KB Items: Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 10/2/2026

Vulnerability Publication Date: 10/5/2026

Reference Information

CVE: CVE-2026-104713

IAVA: 2026-A-1088

Detections

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