A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3), SIMATIC MV540 S…
CVE-2022-33137 is a high-severity vulnerability in SIMATIC MV540 H from Siemens, with a CVSS 3.1 base score of 8.0 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, but only if a user takes part, for example by opening a link or file. Affected SIMATIC MV540 H versions: All versions < V3.3. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.89% chance of exploitation within 30 days, higher than 60% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Simatic Mv540 H Firmware to 3.3 or a later version.
- Update Simatic Mv540 S Firmware to 3.3 or a later version.
- Update Simatic Mv550 H Firmware to 3.3 or a later version.
- Read the advisory on cert-portal.siemens.com for workarounds and exact fixed builds.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Siemens | SIMATIC MV540 H | All versions < V3.3 | Not stated |
| Siemens | SIMATIC MV540 S | All versions < V3.3 | Not stated |
| Siemens | SIMATIC MV550 H | All versions < V3.3 | Not stated |
| Siemens | SIMATIC MV550 S | All versions < V3.3 | Not stated |
| Siemens | SIMATIC MV560 U | All versions < V3.3 | Not stated |
| Siemens | SIMATIC MV560 X | All versions < V3.3 | Not stated |
| Siemens | Simatic Mv540 H Firmware | before 3.3 | 3.3 |
| Siemens | Simatic Mv540 S Firmware | before 3.3 | 3.3 |
| Siemens | Simatic Mv550 H Firmware | before 3.3 | 3.3 |
| Siemens | Simatic Mv550 S Firmware | before 3.3 | 3.3 |
| Siemens | Simatic Mv560 U Firmware | before 3.3 | 3.3 |
| Siemens | Simatic Mv560 X Firmware | before 3.3 | 3.3 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.0 | High | NVD |
| CVSS 2.0 | 6.0 | Medium | NVD |
Official description
A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3), SIMATIC MV540 S (All versions < V3.3), SIMATIC MV550 H (All versions < V3.3), SIMATIC MV550 S (All versions < V3.3), SIMATIC MV560 U (All versions < V3.3), SIMATIC MV560 X (All versions < V3.3). The web session management of affected devices does not invalidate session ids in certain logout scenarios. This could allow an authenticated remote attacker to hijack other users' sessions.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in SIMATIC MV540 H
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
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