CVE-2016-4437

CRITICAL9.8

CISA KEV

Published 2016-06-07 · Updated 2026-06-17 · Source secalert@redhat.com

Summary

CVE-2016-4437 is a critical-severity (CVSS 9.8) vulnerability in Apache Shiro. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 3, 2022. CISA does not currently list it as used in ransomware campaigns. Apache has 41 vulnerabilities in the KEV catalog, 8 of them linked to ransomware.

All 41 known-exploited Apache vulnerabilities →

Description

Apache Shiro before 1.2.5, when a cipher key has not been configured for the "remember me" feature, allows remote attackers to execute arbitrary code or bypass intended access restrictions via an unspecified request parameter.

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

CWE-321

CISA Known-Exploited Vulnerability

Product: Apache — Shiro

Name: Apache Shiro Code Execution Vulnerability

Date added: 2021-11-03 · Due: 2022-05-03

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited Apache vulnerabilities

Most recently added to CISA KEV

CVE-2016-3081
Struts — Apache Struts Command Injection Vulnerability
added 2026-10-08
CVE-2026-34486
Tomcat — Apache Tomcat Missing Encryption of Sensitive Data Vulnerability
added 2026-08-04
CVE-2026-34197
ActiveMQ — Apache ActiveMQ Improper Input Validation Vulnerability
added 2026-04-16
CVE-2024-38475
HTTP Server — Apache HTTP Server Improper Escaping of Output Vulnerability
added 2025-05-01
CVE-2025-24813
Tomcat — Apache Tomcat Path Equivalence Vulnerability
added 2025-04-01
CVE-2024-45195
OFBiz — Apache OFBiz Forced Browsing Vulnerability
added 2025-02-04

View all →

Related CVEs

Same severity, most recent

CVE-2026-58490
Tracecat is an open-source security automation platform for teams and AI agents. From version 0.37.0 until 1.0.0-beta.49, Docker Compose deployments with SAML enabled can render SAML_SIGNED_ASSERTIONS and SAML_SIGNED_RESPONSES as empty values, overriding secure application defaults and disabling both signature requirements. An unauthenticated attacker who can reach the SAML assertion consumer endpoint can submit a forged unsigned response for an existing Tracecat user email address and obtain that user’s session. Targeting an existing superadmin can result in superadmin account takeover. Exploitation does not create users when SAML user creation is disabled and does not affect default Fargate or Helm deployments. Version 1.0.0-beta.49 removes the insecure deployment pass-through and requires signed assertions and responses.
2026-11-06 · score 9.8
CVE-2026-71495
Wanderer is a self-hosted trail database for saving and sharing adventures. Prior to 0.20.0, when PUBLIC_PRIVATE_INSTANCE is not set to true, the unauthenticated POST /api/v1/trail/download handler passes the attacker-controlled JSON url field directly to event.fetch() and returns the fetched response. This allows requests to internal services such as db:8090 and search:7700, cloud metadata addresses, and other network destinations, exposing returned data and permitting internal network reconnaissance or denial of service. This issue is fixed in version 0.20.0.
2026-11-06 · score 10.0
CVE-2026-119923
A heap-based buffer overflow in the TDS prelogin parser in the Babelfish for PostgreSQL extension versions 1.0-1.5, 2.1-2.15, 3.1-3.12, 4.0-4.8, 5.1-5.4 and in Amazon Aurora PostgreSQL with Babelfish might allow remote attackers to execute arbitrary OS commands as the database process user via a specially crafted malformed TDS prelogin packet to the TDS port. This record consolidates a related NULL-pointer-dereference finding in the same prelogin parser. To remediate this issue, we recommend users upgrade to Babelfish for PostgreSQL extension versions 4.10, 5.6, 6.1 or later. As a workaround, restrict network access to the TDS port (default 1433). Customers using Amazon Aurora PostgreSQL with Babelfish should upgrade their cluster to Aurora PostgreSQL 13.9.16 (1.5.5), 13.23.3 (1.17.2), 14.6.16 (2.3.5), 14.17.8 (2.12.4), 14.18.6 (2.13.3), 14.19.5 (2.14.2), 14.20.5 (2.15.2), 14.22.3 (2.16.1), 14.23.1 (2.17.0), 15.10.8 (3.8.4), 15.12.8 (3.9.4), 15.13.6 (3.10.3), 15.14.5 (3.11.2), 15.15.5 (3.12.2), 15.17.3 (3.13.1), 15.18.1 (3.14.0), 16.8.8 (4.5.5), 16.9.6 (4.6.3), 16.10.5 (4.7.2), 16.11.5 (4.8.2), 16.13.3 (4.9.1), 16.14.1 (4.10.0), 17.4.8 (5.1.4), 17.5.6 (5.2.3), 17.6.5 (5.3.2), 17.7.5 (5.4.2), 17.9.3 (5.5.1), 17.10.1 (5.6.0), 18.3.4 (6.0.2), 18.4.1 (6.1.0) or later, and apply any pending maintenance to ensure they are on the latest patch.
2026-11-06 · score 9.8
CVE-2026-123832
In JetBrains CLion before 2026.2 code execution was possible in Safe Mode via JSON compilation database
2026-11-06 · score 9.6
CVE-2026-123831
In JetBrains CLion before 2026.2, 2026.1.4 code execution was possible in Safe Mode via Meson project settings
2026-11-06 · score 9.6