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CVE-2020-25111

40
FAUCET Score

CVE-2020-25111 is a critical vulnerability affecting the IPv6 stack in Contiki OS through version 3.0, stemming from an insufficient check for the IPv6 header length. This flaw can be exploited remotely with low complexity, potentially leading to Denial-of-Service or Remote Code Execution. With a CVSS score of 9.8 (Critical), the vulnerability poses a significant risk of complete compromise (Confidentiality, Integrity, Availability). While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered some community and media attention, notably being part of the "AMNESIA:33" disclosures.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.0CPE matchmatch criteria
cpe:2.3:o:contiki-os:contiki-os:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
20.07%
Probability of exploitation in next 30 days
EPSS Percentile
97.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.2007 is in the 94th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

us-cert.cisa.gov / ics/advisories/icsa-20-343-01
Third Party AdvisoryUS Government Resource
kb.cert.org / vuls/id/815128
Third Party AdvisoryUS Government Resource