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NVD / CVE Program· CNA mitre

CVE-2020-17437: An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products.

Noroxi assessment

Priority: Monitor (action score 33/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.8% (FIRST EPSS); higher than 86.7% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: open-iscsi (Debian:12) 2.1.3-1; open-iscsi (openSUSE:Tumbleweed) 2.1.5-80.2; open-iscsi (SUSE:Linux Enterprise Module for Basesystem 15 SP2) 2.1.4-22.14.1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to open-iscsi (Debian:12) 2.1.3-1; open-iscsi (openSUSE:Tumbleweed) 2.1.5-80.2; open-iscsi (SUSE:Linux Enterprise Module for Basesystem 15 SP2) 2.1.4-22.14.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.2 · v3.1—No exploit Fix available
Published
Dec 11, 2020
Updated
Jun 16, 2026
EPSS
2.8% · 86th percentile

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
32 / 40 · 8.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.8%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
uip projectuip
contiki-oscontiki
open-iscsi projectopen-iscsi
siemenssentron 3va com100 firmware
siemenssentron 3va com100
siemenssentron 3va com800 firmware
siemenssentron 3va com800
siemenssentron 3va dsp800 firmware
siemenssentron 3va dsp800
siemenssentron pac2200 clp firmware
siemenssentron pac2200 clp
siemenssentron pac2200 firmware

and 9 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • open-iscsi project open-iscsiup to 2.1.7 inclusive
  • siemens sentron 3va com100 firmwarebefore 4.4.1
  • siemens sentron 3va com800 firmwarebefore 4.4.1
  • siemens sentron 3va dsp800 firmwarebefore 4.0
  • siemens sentron pac2200 clp firmwareall versions
  • siemens sentron pac2200 firmwarebefore 3.2.2
  • siemens sentron pac3200 firmwarebefore 2.4.7
  • siemens sentron pac3200t firmwarebefore 3.2.2
  • siemens sentron pac3220 firmwarebefore 3.2.0
  • siemens sentron pac4200 firmwarebefore 2.3.0
  • uip project uipup to 1.0 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12open-iscsibefore 2.1.3-12.1.3-1
openSUSE:Tumbleweedopen-iscsibefore 2.1.5-80.22.1.5-80.2
SUSE:Linux Enterprise Module for Basesystem 15 SP2open-iscsibefore 2.1.4-22.14.12.1.4-22.14.1
SUSE:Linux Enterprise Module for Legacy 15 SP2open-iscsibefore 2.0.876-13.42.12.0.876-13.42.1
SUSE:Linux Enterprise Server 12 SP2-BCLopen-iscsibefore 2.0.873-46.17.22.0.873-46.17.2
SUSE:Linux Enterprise Server 12 SP3-BCLopen-iscsibefore 2.0.876-53.34.12.0.876-53.34.1
SUSE:OpenStack Cloud 9open-iscsibefore 2.0.876-12.27.22.0.876-12.27.2

Same product

uip project: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-17438An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products.
    45Plan
  • CVE-2020-17439An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products.
    34Monitor
  • CVE-2020-17440An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products.
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-13987Dec 11, 2020 · An issue was discovered in Contiki through 3.0.
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:open-iscsi2.1.3-1 · Debian:12Package registry (OSV)
opensuse:open-iscsi2.1.5-80.2 · openSUSE:TumbleweedPackage registry (OSV)
suse:open-iscsi2.1.4-22.14.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records