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CVE-2020-13987

HIGH
7.5
CVSS Score
Published: December 11, 2020 at 09:37 PM UTC
Updated: June 17, 2026 at 02:54 AM UTC
10 products affected across 3 vendorsUipOpen IscsiSentron 3VA COM100 Firmware· also runs on 1 platform

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Severity
HIGH7.5
Exploit prediction
EPSS 3%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Open Iscsi· Open Iscsi Project
95%
v ≤ 2.1.12
Sentron 3VA COM100 Firmware· Siemens
95%
v < 4.4.1
Affected range stops below 4.4.1, so it looks safe — our inference, not a vendor statement
siemens-sentron-3va-com100 (same device)
Sentron 3VA COM800 Firmware· Siemens
95%
v < 4.4.1
Affected range stops below 4.4.1, so it looks safe — our inference, not a vendor statement
siemens-sentron-3va-com800 (same device)
Sentron PAC3200 Firmware· Siemens
95%
v < 2.4.7
Affected range stops below 2.4.7, so it looks safe — our inference, not a vendor statement
siemens-sentron-7km-pac3200 (same device)
Sentron PAC4200 Firmware· Siemens
95%
v < 2.3.0
Affected range stops below 2.3.0, so it looks safe — our inference, not a vendor statement
siemens-sentron-pac4200 (same device)
Uip· Uip Project
95%
v ≤ 1.0
contiki-os-contiki (environment)
Sentron 3Va Com100· Siemensdevice
80%
All versions
Sentron 3Va Com800· Siemensdevice
80%
All versions
Sentron Pac3200· Siemensdevice
80%
All versions
Sentron Pac4200· Siemensdevice
80%
All versions

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf
x_refsource_MISCThird Party AdvisoryUS Government Resource
Source: [email protected]
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
x_refsource_MISCThird Party AdvisoryUS Government Resource
Source: [email protected]
https://www.kb.cert.org/vuls/id/815128

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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