Is CVE-2026-5447 actively exploited?

No active exploitation of CVE-2026-5447 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-5447 be exploited remotely?

Yes. CVE-2026-5447 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-5447?

CVE-2026-5447 has a CVSS score of 6.3 (MEDIUM).

HOME VULNERABILITIESCVE-2026-5447

MEDIUM

CVE-2026-5447

CWE-122Published: April 9, 2026· Updated: Apr 13, 2026

6.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:9.5th

Official Description

Heap buffer overflow in CertFromX509 via AuthorityKeyIdentifier size confusion. A heap buffer overflow occurs when converting an X.509 certificate internally due to incorrect size handling of the AuthorityKeyIdentifier extension.

NVD Source

Technical Analysis

CVE-2026-5447 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Exploit-DB

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GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

PacketStorm

Security advisories & exploits

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News & Research Mentioning CVE-2026-5447

Gardyn IoT Hub

CISA Alerts· Jul 2, 2026

View CSAF Summary Successful exploitation of these vulnerabilities could allow unauthenticated users to access and control IoT Hub managed devices. The following versions of Gardyn IoT Hub are affected: Home Firmware Studio Firmware Cloud API <2.12.2026 (CVE-2026-13768, CVE-2026-55726, CVE-2026-54477) CVSS Vendor Equipment Vulnerabilities v3 10 Gardyn Gardyn IoT Hub Use of Hard-coded Credentials, Exposure of Sensitive System Information to an Unauthorized Control Sphere, Improper Neutralization of HTTP Headers for Scripting Syntax Background Critical Infrastructure Sectors: Food and Agriculture Countries/Areas Deployed: United States Company Headquarters Location: United States Vulnerabilities Expand All + CVE-2026-13768 Gardyn devices expose a privi [xlite_meta score:73 src:CISA Alerts xlite_fp:36e177a9fd1834613f5cafee0a325c4ab45907b8f24b540e5e04b99b07afc766]