How severe is CVE-2020-13987?

CVE-2020-13987 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-13987 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-13987?

CVE-2020-13987 primarily affects Uip Project Uip. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-13987?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-13987 published?

CVE-2020-13987 was published on 2020-12-11 and last updated on 2026-06-17.

CVE-2020-13987

CVE-2020-13987 is a high-severity vulnerability in Uip Project Uip with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Uip Project Uip
Published: 2020-12-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-13987?: 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.
How severe is CVE-2020-13987?: CVE-2020-13987 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-13987 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-13987?: CVE-2020-13987 primarily affects Uip Project Uip. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-13987?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-13987 published?: CVE-2020-13987 was published on 2020-12-11 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:uip_project:uip:*:*:*:*:*:*:*:*
cpe:2.3:a:open-iscsi_project:open-iscsi:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sentron_3va_com100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sentron_3va_com800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sentron_pac3200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sentron_pac4200_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Uip Project Uip

CVE-2020-17438 — Critical (CVSS 9.8): An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that reassembles fragmented…
CVE-2020-17439 — High (CVSS 8.3): An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS…
CVE-2020-24334 — High (CVSS 8.2): The code that processes DNS responses in uIP through 1.0, as used in Contiki and Contiki-NG, does not check whether the…
CVE-2020-17437 — High (CVSS 8.2): 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…
CVE-2020-24335 — High (CVSS 7.5): An issue was discovered in uIP through 1.0, as used in Contiki and Contiki-NG. Domain name parsing lacks bounds checks,…
CVE-2020-17440 — High (CVSS 7.5): An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS…

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

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