CVE-2020-17530: Remote code execution in Apache Struts

CVE-2020-17530 · Severity: critical · CVSS 3.1 · Exploited in the wild · Published 2022-02-09

Apache Struts 2 is vulnerable to Remote Code Execution due to forced OGNL evaluation of raw user input in tag attributes. An attacker can exploit this by submitting malicious OGNL expressions that the application then evaluates, leading to arbitrary code execution.

Technologies: Apache Struts, org.apache.struts:struts2-core (Maven). Vendors: Apache, Maven.

Quick answers

Is CVE-2020-17530 exploited in the wild?
Yes. CVE-2020-17530 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2020-17530?
Critical severity, with a CVSS score of 3.1, published 9 February 2022.
Which products and versions are affected?
org.apache.struts:struts2-core (Maven) ECOSYSTEM:introduced=2.0.0,fixed=2.5.26.
Is there a fix for CVE-2020-17530?
Yes. org.apache.struts:struts2-core (Maven): upgrade to 2.5.26 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2020-17530 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2020-17530?
Check whether you run Apache Struts or org.apache.struts:struts2-core (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • org.apache.struts:struts2-core (Maven): upgrade to 2.5.26 or later
    # set org.apache.struts:struts2-core to 2.5.26 in your pom.xml or build.gradle

Affected products

  • Apache Struts 2 2.0.0 - 2.5.25

Identifiers

  • CVE-2020-17530
  • GHSA-jc35-q369-45pv

Timeline

  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: disclosed

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