What is CVE-2023-46853?

CVE-2023-46853 is a critical-severity vulnerability in Memcached, classified under Off-by-one Error. CVSS score: 9.8/10. Published 2023-10-27.

How severe is CVE-2023-46853?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Memcached

CVE-2023-46853

In Memcached before 1.6.22, an off-by-one error exists when processing proxy requests in proxy mode, if \n is used instead of \r\n.

Published 2023-10-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (53.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Memcached

Weakness classification (CWE)

CWE-193 — Off-by-one Error

References

github.com/memcached/memcached/compare/1.6.21...1.6.22 (Release Notes)
github.com/memcached/memcached/commit/6987918e9a3094ec4fc8976f01f769f624d790fa (Patch)

Frequently asked questions

What is CVE-2023-46853?: CVE-2023-46853 is a critical-severity vulnerability in Memcached, classified under Off-by-one Error. CVSS score: 9.8/10. Published 2023-10-27.
How severe is CVE-2023-46853?: Critical severity. CVSS v3 base score is 9.8 out of 10.