What’s Vulnerable › Vulnerabilities

CVE-2020-13987

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-11 · updated 2026-06-17
• Weakness: CWE-125

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.

Affected products

• Open-Iscsi Project Open-Iscsi: through 2.1.12
• Siemens Sentron 3Va Com100 Firmware: before 4.4.1 — fixed in 4.4.1
• Siemens Sentron 3Va Com800 Firmware: before 4.4.1 — fixed in 4.4.1
• Siemens Sentron Pac3200 Firmware: before 2.4.7 — fixed in 2.4.7
• Siemens Sentron Pac4200 Firmware: before 2.3.0 — fixed in 2.3.0
• Uip Project Uip: through 1.0

How to fix

Upgrade to a fixed version: 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. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
• https://www.kb.cert.org/vuls/id/815128
• https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
• https://www.kb.cert.org/vuls/id/815128

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