CVE-2026-4113: SonicWall SMA 1000 Series credential enumeration via response discrepancy

CVE-2026-4113 · Severity: high · CVSS 7.2 · Published 2026-04-09

SonicWall SMA 1000 series appliances, which provide secure remote access to corporate networks, are affected by a vulnerability that allows attackers to identify valid user credentials. By observing subtle differences in how the system responds to login attempts, an attacker can determine which usernames or passwords are valid. This information can be used to facilitate unauthorized access to the corporate network and sensitive internal data.

Technologies: SonicWall SMA 1000 Series Firmware. Vendors: SonicWall.

Quick answers

Is CVE-2026-4113 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-4113 being exploited in the wild.
How severe is CVE-2026-4113?
High severity, with a CVSS score of 7.2, published 9 April 2026.
Which products and versions are affected?
SonicWall SMA 1000 Series Firmware Versions up to 12.4.3-03387 and 12.5.0 up to 12.5.0-02624.
Is there a fix for CVE-2026-4113?
A patch was published on 2026-05-14: NVD updated with specific patched version ranges Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-4113 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-4113?
Check whether you run SonicWall SMA 1000 Series Firmware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is classified as CWE-204 (Observable Response Discrepancy) within the SonicWall SMA 1000 series firmware. It occurs when the appliance provides different responses (such as timing differences or error messages) that allow an attacker to distinguish between valid and invalid user credentials. While the CVSS vector indicates high privileges are required, the nature of credential enumeration typically targets the authentication phase. An attacker can exploit this over the network to conduct brute-force or account harvesting attacks. SonicWall has released firmware updates (12.4.3-03387 and 12.5.0-02624) to address the issue.

Affected products

  • SonicWall SMA 1000 Series Firmware Versions up to 12.4.3-03387 and 12.5.0 up to 12.5.0-02624

Timeline

  • 2026-04-09: disclosed: Initial disclosure by SonicWall
  • 2026-04-09: advisory: NVD publication date
  • 2026-05-14: patched: NVD updated with specific patched version ranges

References

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