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NVD / CVE Program· CNA CERT-PL

CVE-2026-67279: SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS

Noroxi assessment

Priority: This week (action score 60/100)

  • CISA has confirmed exploitation in the wild (Sep 25, 2026). Remediation deadline for US federal agencies: Sep 28, 2026.
  • A ready-made attack tool exists and the flaw can be exploited over the network without an account, so priority is at least “This week”.
  • Probability of exploitation in the next 30 days: 2.2% (FIRST EPSS); higher than 83.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: sshamble (openSUSE:Tumbleweed) 0.3.12-1.1.

Don’t wait for the next maintenance window. Upgrade to sshamble (openSUSE:Tumbleweed) 0.3.12-1.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

MediumCVSS 6.9 · v4.0KEVWeaponized Fix available
Published
Sep 5, 2026
Updated
Sep 26, 2026
EPSS
2.2% · 83th percentile

Report tools

JSON

Action score

60

This week

Don’t wait for the next maintenance window.

CVSS
27 / 40 · 6.9 / 10
CISA KEV
30 / 30 · Listed
EPSS
1 / 30 · 2.2%
Ready-made attack tool
2 / 60 · floor: at least 60

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · CERT-PL
6.9
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Sep 25, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Sep 28, 2026.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-67279

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mikrotikrouteros

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mikrotik routeros6.0 and later · before 6.49.21
  • mikrotik routeros7.0 and later · before 7.23.4
  • mikrotik routeros7.24 and later · before 7.24.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (CERT-PL). Independent of NVD's CPE analysis and usually ahead of it.

  • Mikrotik RouterOS

    • 7.24 and later · before 7.24.2affected
    • 7.0.0 and later · before 7.23.4affected
    • 6.0.0 and later · before 6.49.21affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
openSUSE:Tumbleweedsshamblebefore 0.3.12-1.10.3.12-1.1

Same product

mikrotik: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-14847MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary files and remote authenticated attackers to write aKEV
    95Now
  • CVE-2018-7445A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS session request messages.KEV
    89Now
  • CVE-2026-86060SSH session privilege manipulation via a crafted username in Mikrotik RouterOSKEV
    68This week

Published before and after this one in the same product

  • ← EarlierCVE-2026-67277Sep 5, 2026 · Kernel memory disclosure and denial of service in MikroTik RouterOS btest serviceKEV
    65This week
  • ← EarlierCVE-2026-67278Sep 5, 2026 · TLS server impersonation possible in Mikrotik RouterOS
    25Monitor
  • Later →CVE-2026-67281Sep 5, 2026 · Unauthenticated file read in Mikrotik RouterOS
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
opensuse:sshamble0.3.12-1.1 · openSUSE:TumbleweedPackage registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Proof-of-concept repository on GitHub ×4

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:52026-09-26
Proof-of-concept repository on GitHubstars:82026-09-27
Proof-of-concept repository on GitHubstars:12026-10-08
Proof-of-concept repository on GitHubstars:02026-10-17

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. CISA KEV+19 d
  3. First PoC+20 d
  4. TodayNov 3, 2026+59 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-841 · Improper Enforcement of Behavioral Workflow

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records