Wiesemann & Theis: Small number space for allocating session id in Com-Server family
Multiple W&T products of the Comserver Series use a small number space for allocating sessions ids. After login of an user an unathenticated remote attacker can brute force the users session id and get access to his account on the the device. As the user needs to log in for the attack to be successful a user interaction is required.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Nov 10, 2022
- Updated
- Jun 17, 2026
- EPSS
- 0.8% · 54th percentile
- CWE
- CWE-330
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Report tools
Action score
35
Monitor
Low priority for now.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.8%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · CERTVDE
- 8.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| wut | at-modem-emulator firmware | cpe:2.3:o:wut:at-modem-emulator_firmware |
| wut | at-modem-emulator | cpe:2.3:h:wut:at-modem-emulator |
| wut | com-server \+\+ firmware | cpe:2.3:o:wut:com-server_\+\+_firmware |
| wut | com-server \+\+ | cpe:2.3:h:wut:com-server_\+\+ |
| wut | com-server 20ma firmware | cpe:2.3:o:wut:com-server_20ma_firmware |
| wut | com-server 20ma | cpe:2.3:h:wut:com-server_20ma |
| wut | com-server highspeed 100basefx firmware | cpe:2.3:o:wut:com-server_highspeed_100basefx_firmware |
| wut | com-server highspeed 100basefx | cpe:2.3:h:wut:com-server_highspeed_100basefx |
| wut | com-server highspeed 100baselx firmware | cpe:2.3:o:wut:com-server_highspeed_100baselx_firmware |
| wut | com-server highspeed 100baselx | cpe:2.3:h:wut:com-server_highspeed_100baselx |
| wut | com-server highspeed 19\" 1port firmware | cpe:2.3:o:wut:com-server_highspeed_19\"_1port_firmware |
| wut | com-server highspeed 19\" 1port | cpe:2.3:h:wut:com-server_highspeed_19\"_1port |
and 22 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- wut at-modem-emulator firmwarebefore 1.48
- wut com-server ++ firmwarebefore 1.48
- wut com-server 20ma firmwarebefore 1.48
- wut com-server highspeed 100basefx firmwarebefore 1.76
- wut com-server highspeed 100baselx firmwarebefore 1.76
- wut com-server highspeed 19" 1port firmwarebefore 1.76
- wut com-server highspeed 19" 4port firmwarebefore 1.76
- wut com-server highspeed compact firmwarebefore 1.76
- wut com-server highspeed industry firmwarebefore 1.76
- wut com-server highspeed isolated firmwarebefore 1.76
- wut com-server highspeed lc firmwarebefore 1.48
- wut com-server highspeed oem firmwarebefore 1.76
- wut com-server highspeed office 1port firmwarebefore 1.76
- wut com-server highspeed office 4port firmwarebefore 1.76
- wut com-server highspeed poe 3x isolated firmwarebefore 1.48
- wut com-server highspeed poe firmwarebefore 1.76
- wut com-server highspeed ul firmwarebefore 1.48
Versions reported by the vendor
Affected version ranges reported by the assigning authority (CERTVDE). Independent of NVD's CPE analysis and usually ahead of it.
Wiesemann & Theis AT-Modem-Emulator
- 1.0 and later · before 1.48affected · semver
Wiesemann & Theis Com-Server ++
- 1.0 and later · before 1.48affected · semver
Wiesemann & Theis Com-Server 20mA
- 1.0 and later · before 1.48affected · semver
Wiesemann & Theis Com-Server Highspeed 100BaseFX
- 1.0 and later · before 1.76affected · semver
Wiesemann & Theis Com-Server Highspeed 100BaseLX
- 1.0 and later · before 1.76affected · semver
Wiesemann & Theis Com-Server Highspeed 19" 1Port
- 1.0 and later · before 1.76affected · semver
Wiesemann & Theis Com-Server Highspeed 19" 4Port
- 1.0 and later · before 1.76affected · semver
Wiesemann & Theis Com-Server Highspeed Compact
- 1.0 and later · before 1.76affected · semver
Wiesemann & Theis Com-Server Highspeed Industry
- 1.0 and later · before 1.76affected · semver
Wiesemann & Theis Com-Server Highspeed Isolated
- 1.0 and later · before 1.76affected · semver
Wiesemann & Theis Com-Server Highspeed OEM
- 1.0 and later · before 1.76affected · semver
Wiesemann & Theis Com-Server Highspeed Office 1 Port
- 1.0 and later · before 1.76affected · semver
Same product
wut: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-42785Wiesemann & Theis: Authentication bypass in Com-Server family39Monitor
- CVE-2022-42786Wiesemann & Theis: XSS vulnerability in web interface of the Com-Server family21Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Wiesemann & Theis AT-Modem-Emulator | 1.48 | Vendor (CNA) |
| Wiesemann & Theis Com-Server ++ | 1.48 | Vendor (CNA) |
| Wiesemann & Theis Com-Server 20mA | 1.48 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed 100BaseFX | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed 100BaseLX | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed 19" 1Port | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed 19" 4Port | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed Compact | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed Industry | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed Isolated | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed OEM | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed Office 1 Port | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed Office 4 Port | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server Highspeed PoE | 1.76 | Vendor (CNA) |
| Wiesemann & Theis Com-Server LC | 1.48 | Vendor (CNA) |
| Wiesemann & Theis Com-Server PoE 3 x Isolated | 1.48 | Vendor (CNA) |
| Wiesemann & Theis Com-Server UL | 1.48 | Vendor (CNA) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
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 researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
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.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-330 · Use of Insufficiently Random ValuesCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.