Is CVE-2026-33870 actively exploited?

No active exploitation of CVE-2026-33870 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33870 be exploited remotely?

Yes. CVE-2026-33870 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33870?

CVE-2026-33870 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-33870

CWE-444Published: March 27, 2026· Updated: Mar 30, 2026

7.5

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.7th

Official Description

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, Netty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks. Versions 4.1.132.Final and 4.2.10.Final fix the issue.

NVD Source

Technical Analysis

CVE-2026-33870 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 full integrity compromise (data manipulation), with a CVSS base score of 7.5.