Is CVE-2023-21631 actively exploited?

No active exploitation of CVE-2023-21631 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-21631 be exploited remotely?

Yes. CVE-2023-21631 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-21631?

CVE-2023-21631 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2023-21631

CWE-20Published: July 4, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Weak Configuration due to improper input validation in Modem while processing LTE security mode command message received from network.

NVD Source

Risk Analysis

Qualcomm modem firmware contains a vulnerability due to improper input validation when processing LTE security mode commands. This critical flaw could allow a remote attacker to compromise the modem's security configuration.

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

Recommended Action

Apply the latest firmware updates provided by the device manufacturer for the affected Qualcomm components.

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-2023-21631 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.