CVE
Switch Engine (EXOS) JSON-RPC Authorization Bypass Allows Read-Only Users to Disclose Sensitive Information
- Exploited
- No known exploitation
- Fix
- Fixed in 33.7.1-patch1-11, 33.1.100-patch1-9, 32.7.4.15-patch1-11
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Switch Engine (EXOS) with the JSON-RPC web services interface, which does not enforce the CLI read-only restriction. Attacker holds an authenticated read-only account and can reach the management interface.
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 16/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Extreme Networks Switch Engine (EXOS) has a missing authorization check in its JSON-RPC web interface that lets a logged-in read-only user run CLI show commands that are normally restricted to higher-privileged roles, reachable remotely over the network. Successful exploitation discloses sensitive information, including the device configuration and password hashes for local accounts, and weak passwords could then be cracked offline and lead to administrative access.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
Missing authorization in the JSON-RPC web services interface of Extreme Networks Switch Engine (EXOS) allows an authenticated, low-privileged (read-only) user to execute CLI show commands that are restricted to that role through the command line interface. Successful exploitation results in disclosure of sensitive information, including the device configuration and the password hashes of local accounts. Configuration, enable, and debug commands are not affected. Disclosed password hashes can be attacked offline, and a weak password could lead to administrative access to the device. This issue is fixed in Switch Engine 33.7.1-patch1-11, 33.1.100.133-patch1-9, and 32.7.4.15-patch1-11.
Extreme Networks would like to thank Toàn Lê (GitHub: https://github.com/toanln-cov) for responsibly disclosing this vulnerability and for working with our PSIRT team through coordinated disclosure.
Who should check
Teams running Extreme Networks Switch Engine (EXOS) with JSON-RPC web services enabled and read-only local accounts on the device.
Not fixed by: Upgrading alone does not fix it; local account passwords must also be rotated.
Read the source excerpt
“A missing authorization vulnerability exists in the JSON-RPC web services interface of Extreme Networks Switch Engine (EXOS)”
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach?/20Unknown. No tracked technology or package matched
- Severity8.3/10CVSS 8.3
- No patch0/5No signal
What would change the score
- Would score about 66 if added to CISA KEV
- Would score about 61 if CISA's SSVC rates exploitation active
- Would score about 23 if CISA's SSVC rates it automatable
What to do
Check whether your setup matches what the bug needs.
Switch Engine (EXOS) with the JSON-RPC web services interface, which does not enforce the CLI read-only restriction. Attacker holds an authenticated read-only account and can reach the management interface.Upgrade to a fixed version: 33.7.1-patch1-11, 33.1.100-patch1-9, 32.7.4.15-patch1-11.
Workaround: Disable the web services (JSON-RPC) interface where it is not required, restrict management access to trusted networks, and limit read-only accounts.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-105440 (Switch Engine (EXOS) JSON-RPC Authorization Bypass Allows Read-Only Users to Disclose Sensitive Information), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-105440 (entry last updated 2026-11-11):
Affected:
- Extreme Networks Switch Engine (EXOS): from 33.7.0, fixed in 33.7.1-patch1-11; from 33.1.0, fixed in 33.1.100-patch1-9; from 32.0.0, fixed in 32.7.4.15-patch1-11
Fixed versions: 33.7.1-patch1-11, 33.1.100-patch1-9, 32.7.4.15-patch1-11.
Conditions (all must be true for the bug to be hit):
- Switch Engine (EXOS) with the JSON-RPC web services interface, which does not enforce the CLI read-only restriction. (source: https://extreme-networks.my.site.com/ExtrArticleDetail?an=000140004)
- Attacker holds an authenticated read-only account and can reach the management interface. (source: https://extreme-networks.my.site.com/ExtrArticleDetail?an=000140004)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, low-privilege login, no user action.
Workaround: Disable the web services (JSON-RPC) interface where it is not required, restrict management access to trusted networks, and limit read-only accounts. (source: https://www.cve.org/CVERecord?id=CVE-2026-105440)
CISA KEV: CVE-2026-105440 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-105440 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://extreme-networks.my.site.com/ExtrArticleDetail?an=000140004
- https://www.cve.org/CVERecord?id=CVE-2026-105440
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-105440
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-105440"}.Timeline
- CVE published
- Record last updated
- First seen by cve.now
Affected versions
- Extreme Networks Switch Engine (EXOS)
From 33.7.0 · fixed in 33.7.1-patch1-11; From 33.1.0 · fixed in 33.1.100-patch1-9; From 32.0.0 · fixed in 32.7.4.15-patch1-11
Evidence 3
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Other links · 1
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-105440
Is CVE-2026-105440 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
The JSON-RPC web services interface does not enforce the read-only restriction that the CLI applies, so a user with a read-only account can run show commands that the role is denied. Those commands can disclose the device configuration and the password hashes of local accounts, and weak passwords could then lead to administrative access.Source: extreme-networks.my.site.com, cve.org
Which versions are affected by CVE-2026-105440?
Switch Engine (EXOS): from 33.7.0 before 33.7.1-patch1-11; from 33.1.0 before 33.1.100-patch1-9; from 32.0.0 before 32.7.4.15-patch1-11.Source: cve.now feed data
Am I affected, and how do I check?
Affected builds are Switch Engine (EXOS) 32.0.0 up to 32.7.4.15-patch1-11, 33.1.0 up to 33.1.100-patch1-9, and 33.7.0 up to 33.7.1-patch1-11. To check a device, look at the software version reported by the show version command and confirm whether the JSON-RPC web services interface is enabled. The issue also requires an authenticated read-only account that can reach the management interface.Source: extreme-networks.my.site.com, cve.org
How do I fix CVE-2026-105440?
Upgrade to a fixed version: 33.7.1-patch1-11, 33.1.100-patch1-9, 32.7.4.15-patch1-11.Source: cve.now feed data