A stack-based buffer overflow in the LAN UPnP service running on UDP port 1900 of…
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
A stack-based buffer overflow in the LAN UPnP service running on UDP port 1900 of Swisscom Internet-Box (2, Standard, and Plus) prior to v09.04.00 and Internet-Box light prior to v08.05.02 allows remote code execution. No authentication is required to exploit this vulnerability. Sending a simple UDP packet to port 1900 allows an attacker to execute code on a remote device. However, this is only possible if the attacker is inside the LAN. Because of ASLR, the success rate is not 100% and leads instead to a DoS of the UPnP service. The remaining functionality of the Internet Box is not affected. A reboot of the Internet Box is necessary to attempt the exploit again.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:swisscom:internet-box_standard_firmware:*:*:*:*:*:*:*:* | before 09.04.00 | Vulnerable | Swisscom |
| cpe:2.3:h:swisscom:internet-box_2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Swisscom |
| cpe:2.3:h:swisscom:internet-box_standard:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Swisscom |
| cpe:2.3:o:swisscom:internet-box_light_firmware:*:*:*:*:*:*:*:* | before 08.05.02 | Vulnerable | Swisscom |
| cpe:2.3:h:swisscom:internet-box_light:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Swisscom |
| cpe:2.3:o:swisscom:internet-box_plus_firmware:*:*:*:*:*:*:*:* | before 09.04.00 | Vulnerable | Swisscom |
| cpe:2.3:h:swisscom:internet-box_plus:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Swisscom |
| cpe:2.3:o:swisscom:internet-box_2_firmware:*:*:*:*:*:*:*:* | up to 09.04.00 | Vulnerable | Swisscom |
- cpe:2.3:o:swisscom:internet-box_standard_firmware:*:*:*:*:*:*:*:* Versions before 09.04.00 Vulnerable ·Swisscom
- cpe:2.3:h:swisscom:internet-box_2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Swisscom
- cpe:2.3:h:swisscom:internet-box_standard:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Swisscom
- cpe:2.3:o:swisscom:internet-box_light_firmware:*:*:*:*:*:*:*:* Versions before 08.05.02 Vulnerable ·Swisscom
- cpe:2.3:h:swisscom:internet-box_light:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Swisscom
- cpe:2.3:o:swisscom:internet-box_plus_firmware:*:*:*:*:*:*:*:* Versions before 09.04.00 Vulnerable ·Swisscom
- cpe:2.3:h:swisscom:internet-box_plus:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Swisscom
- cpe:2.3:o:swisscom:internet-box_2_firmware:*:*:*:*:*:*:*:* Versions up to 09.04.00 Vulnerable ·Swisscom
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-16596
- 2026-10-03 Alias added: GHSA-2fhx-4cr3-fgxc
References
More Swisscom Internet-box 2 Firmware vulnerabilities
- TI-2020-12689 An issue was discovered on Swisscom Internet Box 2, Internet Box Standard, Internet Box… CVSS 3.1HIGH 8.0
Sources
- CVE-2018-16596 · CVE Program
- CVE-2018-16596 · NVD
- FIRST EPSS
- GHSA-2fhx-4cr3-fgxc · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences