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

Q: How do I fix CVE-2023-46853?

memcached: upgrade to 1.6.22. Exact commands for each OS are on this page.

Q: Is CVE-2023-46853 being exploited?

CVE-2023-46853 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-46853 affect?

CVE-2023-46853 affects memcached. Severity is critical (CVSS 9.8). 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.

Q: How urgent is CVE-2023-46853?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2023-46853 is a critical-severity flaw (CVSS 9.8) affecting memcached. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-193
Published	2023-10-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: memcached

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-10-27 20:15 UTCPublished CVE record published
2026-06-17 06:31 UTCUpdated Record last modified

memcached memcached UPGRADE

Affected: < 1.6.22

Fixed in: 1.6.22

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy memcached || rpm -q memcached || memcached --version

2. UPGRADE to 1.6.22 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade memcached

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade memcached

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-46853?

memcached: upgrade to 1.6.22. Exact commands for each OS are on this page.

Is CVE-2023-46853 being exploited?

CVE-2023-46853 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-46853 affect?

CVE-2023-46853 affects memcached. Severity is critical (CVSS 9.8). 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.

How urgent is CVE-2023-46853?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Memcached vulnerabilities

Related CVEs

CVE-2023-46852 HIGH 7.5 UPGRADE In Memcached before 1.6.22, a buffer overflow exists when processing multiget requests in proxy mode, if there
CVE-2022-48571 HIGH 7.5 DOWNGRADE memcached 1.6.7 allows a Denial of Service via multi-packet uploads in UDP.
CVE-2022-26635 CRITICAL 9.8 UPGRADE PHP-Memcached v2.2.0 and below contains an improper NULL termination which allows attackers to execute CLRF in
CVE-2021-37519 MEDIUM 5.5 DOWNGRADE Buffer Overflow vulnerability in authfile.c memcached 1.6.9 allows attackers to cause a denial of service via
CVE-2020-22570 HIGH 7.5 UPGRADE Memcached 1.6.0 before 1.6.3 allows remote attackers to cause a denial of service (daemon crash) via a crafted

References

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