What is CVE-2020-22283?

CVE-2020-22283 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-2020-22283?

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

Buffer overflow in Lwip Project

CVE-2020-22283

A buffer overflow vulnerability in the icmp6_send_response_with_addrs_and_netif() function of Free Software Foundation lwIP version git head allows attackers to access sensitive information via a crafted ICMPv6 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: 0.014 (71.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Lwip Project

Weakness classification (CWE)

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

References

savannah.nongnu.org/bugs/index.php (Patch, Vendor Advisory)
lists.debian.org/debian-lts-announce/2023/11/msg00011.html (mailing-list)

Frequently asked questions

What is CVE-2020-22283?: CVE-2020-22283 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-2020-22283?: High severity. CVSS v3 base score is 7.5 out of 10.