CVE-2023-34137Network attack vector

Unauthenticated CAS API access via forgeable HMAC tokens

Published Jul 13, 2023 · Updated Oct 30, 2024

Authentication bypass in SonicWall GMS 9.3.2-SP1 and earlier and Analytics 2.5.0.4-R7 and earlier allows remote attackers to access the CAS API. The /ws/cas service computes HMAC-SHA1 over the supplied username with a static secret, letting attackers forge accepted tokens. No account or user interaction is required; a forged token permits legitimate CAS API calls and can expose further API flaws.

CVSS severity9.4
Critical
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in SonicWall GMS 9.3.2-SP1 and earlier and Analytics 2.5.0.4-R7 and earlier allows remote attackers to access the CAS API. The /ws/cas service computes HMAC-SHA1 over the supplied username with a static secret, letting attackers forge accepted tokens. No account or user interaction is required; a forged token permits legitimate CAS API calls and can expose further API flaws.

The record

CVE
CVE-2023-34137
Published
Jul 13, 2023
Updated
Oct 30, 2024
Vendor
SonicWall
Product
Global Management System (GMS)
Classifications
CWE-305, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.3.2-SP1 and earlier versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SonicWall · Global Management System (GMS)version=9.3.2-SP1 and earlier versions
SonicWall · SonicWall Analyticsversion=2.5.0.4-R7 and earlier versions

Published CVSS scores

9.4NCC GroupCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-305Authentication Bypass by Primary Weakness
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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