What is CVE-2020-22284?

CVE-2020-22284 is a high-severity vulnerability in Lwip Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-07-22.

How severe is CVE-2020-22284?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2020-22284 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Lwip Project

CVE-2020-22284

A buffer overflow vulnerability in the zepif_linkoutput() function of Free Software Foundation lwIP git head version and version 2.1.2 allows attackers to access sensitive information via a crafted 6LoWPAN packet.

Vulnerability class: Buffer Overflow

Published 2021-07-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (66.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Lwip Project — versions 2.1.2

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

savannah.nongnu.org/bugs/index.php (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-22284?: CVE-2020-22284 is a high-severity vulnerability in Lwip Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-07-22.
How severe is CVE-2020-22284?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2020-22284 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.