CVE-2016-3081highunder attackCWE-77

CVE-2016-3081

Published · Updated

Follow this CVE+ Monitor Apache Struts+ Monitor org.apache.struts:struts2-core

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

100Vexday Risk Score

Patch now. It under exploitation confirmed by CISA, has an official Brazilian government alert and has a working public exploit.

ssvc Actcvss 8.1epss 97%
from disclosure to weapon6 days
Published on NVDApr 26
1st PoC+6d
metasploit+1d
CISA KEV+3817d
Official alert in Brazil

Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.

  • CTIR Gov · ALERTA 92/2026 · 09 Oct 2026Vulnerabilidade crítica que afeta o Struts.read on gov.br ↗
Source: CTIR Gov (GSI) and CISC Gov.br, under the CC BY-ND 3.0 license.
Action required by CISAfederal deadline: 2026-10-11

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

In short

Apache Struts 2 allows attackers to run harmful code on servers when a feature called Dynamic Method Invocation is turned on. An attacker can abuse how the application handles method calls to execute whatever commands they want.

Technical detail

CVE-2016-3081 affects Apache Struts 2 versions 2.3.19–2.3.20.2, 2.3.21–2.3.24.1, and 2.3.25–2.3.28 when Dynamic Method Invocation (DMI) is enabled. The vulnerability stems from improper validation of the 'method:' prefix in OGNL expressions, allowing unauthenticated remote attackers to chain expressions and achieve arbitrary code execution on the server. Exploitation requires only network access to a vulnerable Struts application with DMI active.

Summary generated and translated by AI from the official description.
Apache Struts 2.3.19 to 2.3.20.2, 2.3.21 to 2.3.24.1, and 2.3.25 to 2.3.28, when Dynamic Method Invocation is enabled, allow remote attackers to execute arbitrary code via method: prefix, related to chained expressions.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
n/a · n/a
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.