Is CVE-2020-17437 actively exploited?

No active exploitation of CVE-2020-17437 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-17437 be exploited remotely?

Yes. CVE-2020-17437 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-17437?

CVE-2020-17437 has a CVSS score of 8.2 (HIGH).

HOME VULNERABILITIESCVE-2020-17437

HIGH

CVE-2020-17437

CWE-787Published: December 11, 2020· Updated: Jun 17, 2026

8.2

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-17437 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 8.2.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityHigh

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

Affected Vendors & Products

contiki-os1 product(s)

contiki

open-iscsi_project1 product(s)

open-iscsi

siemens18 product(s)

sentron 3va com100 firmwaresentron 3va com100sentron 3va com800 firmwaresentron 3va com800sentron 3va dsp800 firmwaresentron 3va dsp800sentron pac2200 clp firmwaresentron pac2200 clpsentron pac2200 firmwaresentron pac2200sentron pac3200 firmwaresentron pac3200+6

uip_project1 product(s)

uip

Source: NVD CPE · 21 total CPE entries