HOMEVULNERABILITIESCVE-2021-26605
UNKNOWNCISA KEVIN THE WILD

CVE-2021-26605

Published: April 11, 2026

EPSS:0.60%probability of exploitation in 30 daysPercentile:69.4th

Official Description

An improper input validation vulnerability in the service of ezPDFReader allows attacker to execute arbitrary command. This issue occurred when the ezPDF launcher received and executed crafted input values through JSON-RPC communication.

NVD Source

Technical Analysis

CVE-2021-26605 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-26605 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.

Exploit & PoC Resources

ACTIVE EXPLOITATIONConfirmed exploitation in the wild
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Quick Facts

CVE IDCVE-2021-26605
Severity—
CISA KEVYES — Active Exploitation
ExploitIN THE WILD
EPSS (30d)0.60%
PublishedApr 11, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-26605 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
  • !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
  • !Active exploitation confirmed — treat as P1
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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