Is CVE-2023-33966 actively exploited?

No active exploitation of CVE-2023-33966 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-33966 be exploited remotely?

Yes. CVE-2023-33966 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-33966?

CVE-2023-33966 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2023-33966

CWE-269Published: May 31, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Deno is a runtime for JavaScript and TypeScript. In deno 1.34.0 and deno_runtime 0.114.0, outbound HTTP requests made using the built-in `node:http` or `node:https` modules are incorrectly not checked against the network permission allow list (`--allow-net`). Dependencies relying on these built-in modules are subject to the vulnerability too. Users of Deno versions prior to 1.34.0 are unaffected. Deno Deploy users are unaffected. This problem has been patched in Deno v1.34.1 and deno_runtime 0.114.1 and all users are recommended to update to this version. No workaround is available for this issue.

NVD Source

Risk Analysis

Deno versions 1.34.0 and deno_runtime 0.114.0 fail to enforce network permission restrictions for outbound HTTP requests made via built-in modules. This allows malicious code to bypass security policies and communicate with unauthorized network destinations.

No public exploit is known, and it is not in the CISA KEV. The vulnerability is remotely exploitable with low complexity.

Recommended Action

Update Deno to version 1.34.1 and deno_runtime to 0.114.1 immediately.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2023-33966 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.