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Fencer Vulns
high 7.5

CVE-2020-13987 json

An issue was discovered in Contiki through 3.0.

published 2020-12-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-6157

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

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.

Patch / fix

  • siemens sentron_3va_com100_firmware 4.4.1
  • siemens sentron_3va_com800_firmware 4.4.1
  • siemens sentron_pac3200_firmware 2.4.7
  • siemens sentron_pac4200_firmware 2.3.0
  • open-iscsi Debian 14, Debian 13, Debian 12 2.1.3-1

debian advisories DEBIAN-CVE-2020-13987

  • open-iscsi Ubuntu 20.04 LTS 2.0.874-7.1ubuntu6.4
  • open-iscsi Ubuntu Pro 16.04 LTS 2.0.873+git0.3b4b4500-14ubuntu3.7+esm1
  • open-iscsi Ubuntu Pro 18.04 LTS 2.0.874-5ubuntu2.11+esm1

ubuntu advisories UBUNTU-CVE-2020-13987

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • iscsi-initiator-utils RHEL 8 6.2.1.4-4.git095f59c.el8
  • python3-iscsi-initiator-utils RHEL 8 6.2.1.4-4.git095f59c.el8
  • iscsi-initiator-utils-iscsiuio RHEL 8 6.2.1.4-4.git095f59c.el8

red hat advisories RHBA-2021:4446

  • open-iscsi SLES 12 SP3-BCL 2.0.876-53.34.1
  • open-iscsi SLE Module for Basesystem 15 SP2, SLE Micro 5.0 2.1.4-22.14.1
  • open-iscsi SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +12 more 2.0.876-13.42.1
  • open-iscsi SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +3 more 2.0.876-12.27.2

suse advisories SUSE-SU-2022:2806-1SUSE-RU-2021:1517-1SUSE-SU-2021:1164-1SUSE-SU-2021:0663-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-13987 updated cvss 5.3

Open-iSCSI: OOB read in checksum calculation in uIP

  • Red Hat Enterprise Linux 5 iscsi-initiator-utils Red Hat Enterprise Linux 6 iscsi-initiator-utils
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 iscsi-initiator-utils, iscsi-initiator-utils-iscsiuio
    affected: no fix available “Fix deferred”
  • Red Hat CodeReady Linux Builder (v. 8) iscsi-initiator-utils-devel 6.2.1.4-4.git095f59c.el8, iscsi-initiator-utils-debuginfo 6.2.1.4-4.git095f59c.el8, iscsi-initiator-utils-debugsource 6.2.1.4-4.git095f59c.el8, python3-iscsi-initiator-utils-debuginfo 6.2.1.4-4.git095f59c.el8, iscsi-initiator-utils-iscsiuio-debuginfo 6.2.1.4-4.git095f59c.el8 Red Hat Enterprise Linux BaseOS (v. 8) iscsi-initiator-utils 6.2.1.4-4.git095f59c.el8, python3-iscsi-initiator-utils 6.2.1.4-4.git095f59c.el8, iscsi-initiator-utils-iscsiuio 6.2.1.4-4.git095f59c.el8
    fixed: vendor fix RHBA-2021:4446
  • Red Hat Enterprise Linux 9 iscsi-initiator-utils, python3-iscsi-initiator-utils, iscsi-initiator-utils-iscsiuio
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-21-068-06 updated cvss 6.5

Siemens TCP/IP Stack Vulnerabilities-AMNESIA:33 in SENTRON PAC / 3VA Devices (Update C)

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-20-343-01 updated cvss 8.2

Multiple Embedded TCP/IP Stacks

  • multiple open source FNET 4.6.3 multiple open source Nut/Net <= 5.1 multiple open source open-iscsi <= 2.1.12 multiple open source picoTCP (EOL) <= 1.7.0 multiple open source picoTCP-NG <= 1.7.0 multiple open source uIP (EOL) <= 1.0
    +2 more products
    multiple open source uIP-Contiki-NG <= 4.5 multiple open source uIP-Contiki-OS (end-of-life [EOL]) <= 3.0
    affected: vendor fix yanzi.dev

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

3.32% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.