An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products.
Priority MEDIUM 41CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · High
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. When the Urgent flag is set in a TCP packet, and the stack is configured to ignore the urgent data, the stack attempts to use the value of the Urgent pointer bytes to separate the Urgent data from the normal data, by calculating the offset at which the normal data should be present in the global buffer. However, the length of this offset is not checked; therefore, for large values of the Urgent pointer bytes, the data pointer can point to memory that is way beyond the data buffer in uip_process in uip.c.
Why it matters now
EPSS 0.02862 86th percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned
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 · 21
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:uip_project:uip:*:*:*:*:*:*:*:* | up to 1.0 | Vulnerable | Uip Project |
| cpe:2.3:o:contiki-os:contiki:*:*:*:*:*:*:*:* | up to 3.0 | Running on | Contiki-os |
| cpe:2.3:a:open-iscsi_project:open-iscsi:*:*:*:*:*:*:*:* | up to 2.1.7 | Vulnerable | Open-iscsi Project |
| cpe:2.3:o:siemens:sentron_3va_com100_firmware:*:*:*:*:*:*:*:* | before 4.4.1 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sentron_3va_com100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sentron_3va_com800_firmware:*:*:*:*:*:*:*:* | before 4.4.1 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sentron_3va_com800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sentron_3va_dsp800_firmware:*:*:*:*:*:*:*:* | before 4.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sentron_3va_dsp800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sentron_pac2200_clp_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Siemens |
- cpe:2.3:a:uip_project:uip:*:*:*:*:*:*:*:* Versions up to 1.0 Vulnerable ·Uip Project
- cpe:2.3:o:contiki-os:contiki:*:*:*:*:*:*:*:* Versions up to 3.0 Running on ·Contiki-os
- cpe:2.3:a:open-iscsi_project:open-iscsi:*:*:*:*:*:*:*:* Versions up to 2.1.7 Vulnerable ·Open-iscsi Project
- cpe:2.3:o:siemens:sentron_3va_com100_firmware:*:*:*:*:*:*:*:* Versions before 4.4.1 Vulnerable ·Siemens
- cpe:2.3:h:siemens:sentron_3va_com100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sentron_3va_com800_firmware:*:*:*:*:*:*:*:* Versions before 4.4.1 Vulnerable ·Siemens
- cpe:2.3:h:siemens:sentron_3va_com800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sentron_3va_dsp800_firmware:*:*:*:*:*:*:*:* Versions before 4.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:sentron_3va_dsp800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sentron_pac2200_clp_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Siemens
Show 11 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:h:siemens:sentron_pac2200_clp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sentron_pac2200_firmware:*:*:*:*:*:*:*:* | before 3.2.2 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sentron_pac2200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sentron_pac3200_firmware:*:*:*:*:*:*:*:* | before 2.4.7 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sentron_pac3200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sentron_pac3200t_firmware:*:*:*:*:*:*:*:* | before 3.2.2 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sentron_pac3200t:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sentron_pac3220_firmware:*:*:*:*:*:*:*:* | before 3.2.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sentron_pac3220:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:sentron_pac4200_firmware:*:*:*:*:*:*:*:* | before 2.3.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:sentron_pac4200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
- cpe:2.3:h:siemens:sentron_pac2200_clp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sentron_pac2200_firmware:*:*:*:*:*:*:*:* Versions before 3.2.2 Vulnerable ·Siemens
- cpe:2.3:h:siemens:sentron_pac2200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sentron_pac3200_firmware:*:*:*:*:*:*:*:* Versions before 2.4.7 Vulnerable ·Siemens
- cpe:2.3:h:siemens:sentron_pac3200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sentron_pac3200t_firmware:*:*:*:*:*:*:*:* Versions before 3.2.2 Vulnerable ·Siemens
- cpe:2.3:h:siemens:sentron_pac3200t:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sentron_pac3220_firmware:*:*:*:*:*:*:*:* Versions before 3.2.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:sentron_pac3220:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:sentron_pac4200_firmware:*:*:*:*:*:*:*:* Versions before 2.3.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:sentron_pac4200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
Not affected: 3 products
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2020-17437
- 2026-10-03 Alias added: GHSA-cfgh-w4j7-hfhp
References
Sources
- CVE-2020-17437 · CVE Program
- CVE-2020-17437 · NVD
- FIRST EPSS
- GHSA-cfgh-w4j7-hfhp · GitHub Advisory Database · CC BY 4.0
- CVE-2020-17437 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences