How severe is CVE-2026-27849?

CVE-2026-27849 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-27849 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-27849?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-27849 have an EU (EUVD) identifier?

Yes. CVE-2026-27849 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8688.

When was CVE-2026-27849 published?

CVE-2026-27849 was published on 2026-02-25 and last updated on 2026-06-17.

CVE-2026-27849

CVE-2026-27849 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8688
Weakness: CWE-78
Published: 2026-02-25
Last modified: 2026-06-17

Description

Due to missing neutralization of special elements, OS commands can be injected via the update functionality of a TLS-SRP connection, which is normally used for configuring devices inside the mesh network. This issue affects MR9600: 1.0.4.205530; MX4200: 1.0.13.210200.

Frequently asked questions

What is CVE-2026-27849?: Due to missing neutralization of special elements, OS commands can be injected via the update functionality of a TLS-SRP connection, which is normally used for configuring devices inside the mesh network. This issue affects MR9600: 1.0.4.205530; MX4200: 1.0.13.210200.
How severe is CVE-2026-27849?: CVE-2026-27849 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-27849 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-27849?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-27849 have an EU (EUVD) identifier?: Yes. CVE-2026-27849 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8688.
When was CVE-2026-27849 published?: CVE-2026-27849 was published on 2026-02-25 and last updated on 2026-06-17.

References

https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-011.txt

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