CVE-2020-35684

HIGH
7.5
CVSS Score
Published: August 19, 2021 at 11:19 AM UTC
Updated: June 17, 2026 at 03:14 AM UTC
5 products affected across 2 vendorsNichestackSentron 3WA COM190 FirmwareSentron 3WL COM35 Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

An issue was discovered in HCC Nichestack 3.0. The code that parses TCP packets relies on an unchecked value of the IP payload size (extracted from the IP header) to compute the length of the TCP payload within the TCP checksum computation function. When the IP payload size is set to be smaller than the size of the IP header, the TCP checksum computation function may read out of bounds (a low-impact write-out-of-bounds is also possible).

Affected

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

v < 2.0.0
Affected range stops below 2.0.0, so it looks safe — our inference, not a vendor statement
siemens-sentron-3wa-com190 (same device)
v < 1.2.0
Affected range stops below 1.2.0, so it looks safe — our inference, not a vendor statement
siemens-sentron-3wl-com35 (same device)
All versions
All versions

Remediation

No guide yet

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

References (4)

x_refsource_CONFIRMMitigationThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf
x_refsource_MISCProduct
https://www.hcc-embedded.com
Third Party Advisoryx_refsource_CERT-VNUS Government Resource
https://www.kb.cert.org/vuls/id/608209

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20

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