CVE-2020-13987

Name: CVE-2020-13987
Creator: NVD / NIST
Published: 2020-12-11T22:15:12.543+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.19%

Last modified Jun 17, 2026

CVE-2020-13987 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in Contiki through 3.0. An Out-of-Bounds Read vulnerability exists in the uIP TCP/IP Stack component when calculating the checksums for IP packets in upper_layer_chksum in net/ipv4/uip.c.. EPSS estimates a 3.19% chance of exploitation in the next 30 days.

Description

An issue was discovered in Contiki through 3.0. An Out-of-Bounds Read vulnerability exists in the uIP TCP/IP Stack component when calculating the checksums for IP packets in upper_layer_chksum in net/ipv4/uip.c.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

3.19%

86.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Uip Project	Uip	<= 1.0
Open-Iscsi Project	Open-Iscsi	<= 2.1.12
Siemens	Sentron 3va Com100 Firmware	< 4.4.1
Siemens	Sentron 3va Com800 Firmware	< 4.4.1
Siemens	Sentron Pac3200 Firmware	< 2.4.7
Siemens	Sentron Pac4200 Firmware	< 2.3.0

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

Timeline

Published: Dec 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-13987?

How severe is CVE-2020-13987?

CVE-2020-13987 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.19% probability of exploitation in the next 30 days.

How do I fix CVE-2020-13987?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-13987?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST