Is CVE-2022-4639 actively exploited?

No active exploitation of CVE-2022-4639 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2022-4639 be exploited remotely?

Yes. CVE-2022-4639 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2022-4639?

CVE-2022-4639 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2022-4639

CWE-119Published: December 21, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

A vulnerability, which was classified as critical, has been found in sslh. This issue affects the function hexdump of the file probe.c of the component Packet Dumping Handler. The manipulation of the argument msg_info leads to format string. The attack may be initiated remotely. The name of the patch is b19f8a6046b080e4c2e28354a58556bb26040c6f. It is recommended to apply a patch to fix this issue. The identifier VDB-216497 was assigned to this vulnerability.

NVD Source

Risk Analysis

The sslh packet dumping handler is vulnerable to a format string attack in the hexdump function. This critical remote vulnerability could allow an attacker to execute arbitrary code.

There is no public exploit known, and it is not listed in the KEV catalog.

Recommended Action

Apply the vendor-provided patch to fix the format string vulnerability in the packet dumping handler.

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-2022-4639 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.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.