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CVE-2016-4437

Apache — Apache Shiro Code Execution Vulnerability

Apache · CWE-321 · in CISA KEV since 2021-11-03

ExigentKEV since 2021 · listed over a yearCISA KEVActively Exploited
85

EVRS 85 of 100 Immediate

Out-of-Band / Urgent Remediation

Rank 388 of 2,960 tracked

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Why it scores 85

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.930.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

  • org.apache.shiro:shiro-core1.2.5

Affected versions

  • org.apache.shiro:shiro-core (maven)affected <= 1.2.4, fixed in 1.2.5

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD and GitHub. Affected packages also in GitHub Advisory GHSA-p836-389h-j692 (CC BY 4.0).

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.8 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.930 (99.83rd pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2022-05-03 · KEV since 2021 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. Public module exists Metasploit
EUVD cross-referenceENISA's record: CVSS 9.8 (v3.1), assigned by redhat. Listed ENISA EUVD

Description

NVD

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.

What CISA says to do

Public module

Metasploit lists a public excellent-rank module for this CVE: Apache Shiro v1.2.4 Cookie RememberME Deserial RCE (multi/http/shiro_rememberme_v124_deserialize). A module existing is not the same as active exploitation; see metasploit.com.