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.

Published: 2020-12-11 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-13987 is rated Moderate Risk (41.8/100): CVSS High severity, with low exploitation likelihood (EPSS 0.14%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-13987

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-11 0.19% 0.14% -0.04%
2 2025-12-13 0.13% 0.19% +0.05%
3 2025-11-21 — 0.13% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-13987

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-13987

OS Trackers for CVE-2020-13987

vendor priority summary link
debian not yet assigned CVE-2020-13987 not yet assigned priority: Debian including 1 source packages (open-iscsi), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-13987
redhat medium — https://access.redhat.com/security/cve/CVE-2020-13987
suse high CVE-2020-13987 severity important: SUSE including 64 source package names (0.38.1.5.8.40:libopeniscsiusr0_2_0-2.1.4-22.14.1, 0.38.1.5.8.40:open-iscsi-2.1.4-22.14.1, …), 218 product×package rows across 63 product lines (Container suse/sles/15.2/virt-launcher, Image SLES12-SP5-Azure-BYOS, … (63 product lines)): Fixed 208, Known Not Affected 10. https://www.suse.com/security/cve/CVE-2020-13987/
ubuntu low CVE-2020-13987 low priority: Ubuntu including 1 source packages (open-iscsi), 11 status rows across 11 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, trusty, upstream, xenial): released 9, ignored 1, not-affected 1. https://ubuntu.com/security/CVE-2020-13987

Affected software / configurations for CVE-2020-13987

Vendor Product Version Raw CPE
uip_project uip <= 1.0 cpe:2.3:a:uip_project:uip:*:*:*:*:*:*:*:*
open-iscsi_project open-iscsi <= 2.1.12 cpe:2.3:a:open-iscsi_project:open-iscsi:*:*:*:*:*:*:*:*
siemens sentron_3va_com100_firmware < 4.4.1 cpe:2.3:o:siemens:sentron_3va_com100_firmware:*:*:*:*:*:*:*:*
siemens sentron_3va_com800_firmware < 4.4.1 cpe:2.3:o:siemens:sentron_3va_com800_firmware:*:*:*:*:*:*:*:*
siemens sentron_pac3200_firmware < 2.4.7 cpe:2.3:o:siemens:sentron_pac3200_firmware:*:*:*:*:*:*:*:*
siemens sentron_pac4200_firmware < 2.3.0 cpe:2.3:o:siemens:sentron_pac4200_firmware:*:*:*:*:*:*:*:*

References for CVE-2020-13987

URL Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf Patch Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01 Third Party Advisory US Government Resource
https://www.kb.cert.org/vuls/id/815128 Third Party Advisory US Government Resource
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