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CVE-2020-22284

24
FAUCET Score

CVE-2020-22284 is a buffer overflow vulnerability in the zepif_linkoutput() function of Free Software Foundation's lwIP, affecting git head and version 2.1.2. This flaw allows attackers to access sensitive information by sending a specially crafted 6LoWPAN packet. Rated 7.5 HIGH, it is a network-exploitable vulnerability with low attack complexity, requiring no user interaction, and leading to high confidentiality impact. There is currently no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
2.1.2CPE matchmatch criteria
cpe:2.3:a:lwip_project:lwip:2.1.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.17%
Probability of exploitation in next 30 days
EPSS Percentile
64.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0117 is in the 43rd percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

ubuntupatch availablevia ubuntu_usn
Product: lwip (focal)Fixed in: 2.1.2+dfsg1-4ubuntu0.1~esm1
ubuntupatch availablevia ubuntu_usn
Product: lwip (jammy)Fixed in: 2.1.3+dfsg1-1ubuntu0.1~esm1
ubuntupatch availablevia ubuntu_usn
Product: lwip (noble)Fixed in: 2.2.0+dfsg1-6.1ubuntu0.1~esm1
ubuntupatch availablevia ubuntu_usn
Product: lwip (resolute)Fixed in: 2.2.1+dfsg1-4ubuntu0.1~esm1

Vendor Advisories (1)

ubuntuUSN-8423-1

lwIP vulnerabilities

Jun 11, 2026

References

savannah.nongnu.org / bugs/index.php
PatchThird Party Advisory