CVE-2020-17437
An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.81%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 8.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- EPSS
- 2.81% probability · 86th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- uip project/uip · open-iscsi project/open-iscsi · siemens/sentron 3va com100 firmware · siemens/sentron 3va com800 firmware · siemens/sentron 3va dsp800 firmware · siemens/sentron pac2200 clp firmware · siemens/sentron pac2200 firmware · siemens/sentron pac3200 firmware · siemens/sentron pac3200t firmware · siemens/sentron pac3220 firmware · siemens/sentron pac4200 firmware
- Source
- cve@mitre.org
EPSS 2.8% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdfPatch, Third Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01Third Party Advisory, US Government Resource
- https://www.kb.cert.org/vuls/id/815128Third Party Advisory, US Government Resource
- https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdfPatch, Third Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01Third Party Advisory, US Government Resource
- https://www.kb.cert.org/vuls/id/815128Third Party Advisory, US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.