CVE-2024-37370Network attack vector

Application data truncation via unverified Extra Count

Published Jun 28, 2024 · Updated Jul 14, 2026

GSS token validation in Siemens S7-1500 MFP firmware V3.1.5 and later allows remote attackers to truncate application plaintext. The gss_krb5int_unseal_token_v3 and gss_krb5int_unseal_v3_iov functions trust a plaintext Extra Count value without matching it to the encrypted header. An attacker must modify a confidential wrap token, after which the receiving application processes shortened data with application-dependent consequences.

CVSS severity7.5
High
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

GSS token validation in Siemens S7-1500 MFP firmware V3.1.5 and later allows remote attackers to truncate application plaintext. The gss_krb5int_unseal_token_v3 and gss_krb5int_unseal_v3_iov functions trust a plaintext Extra Count value without matching it to the encrypted header. An attacker must modify a confidential wrap token, after which the receiving application processes shortened data with application-dependent consequences.

The record

CVE
CVE-2024-37370
Published
Jun 28, 2024
Updated
Jul 14, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-130, CWE-345, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record 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=V3.1.5 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*

Published CVSS scores

7.5Siemens ProductCERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.3Siemens ProductCERTCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-130Improper Handling of Length Parameter Inconsistency
CWE-345Insufficient Verification of Data Authenticity
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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