CVE-2026-1627Network attack vector

SSH data manipulation via weak MAC algorithms

Published Feb 27, 2026 · Updated Feb 27, 2026

Weak MAC algorithms in SICK LMS1000 and MRS1000 firmware 2.4.0 and earlier allow man-in-the-middle attackers to alter SSH data. The devices' SSH service permits outdated message-authentication algorithms that do not reliably protect the integrity of transmitted session data. Exploitation requires interaction with network traffic and an active SSH session; the vendor reports integrity impact only.

CVSS severity6.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak MAC algorithms in SICK LMS1000 and MRS1000 firmware 2.4.0 and earlier allow man-in-the-middle attackers to alter SSH data. The devices' SSH service permits outdated message-authentication algorithms that do not reliably protect the integrity of transmitted session data. Exploitation requires interaction with network traffic and an active SSH session; the vendor reports integrity impact only.

The record

CVE
CVE-2026-1627
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
SICK AG
Product
SICK MRS1000
Classifications
CWE-327, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 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=0 <=<=2.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SICK AG · SICK MRS1000version=0 <=<=2.4.0
SICK AG · SICK LMS1000version=0 <=<=2.4.0

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
6.5SICK AGCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A: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-327Use of a Broken or Risky Cryptographic Algorithm
T1565.002Transmitted Data Manipulation

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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