Is CVE-2021-26305 actively exploited?

No active exploitation of CVE-2021-26305 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-26305 be exploited remotely?

Yes. CVE-2021-26305 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-26305?

CVE-2021-26305 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-26305

CRITICAL

CVE-2021-26305

CWE-908Published: January 29, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An issue was discovered in Deserializer::read_vec in the cdr crate before 0.2.4 for Rust. A user-provided Read implementation can gain access to the old contents of newly allocated heap memory, violating soundness.

NVD Source

Technical Analysis

CVE-2021-26305 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.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.