CVE-2022-27924Known exploitationPublic exploitNetwork attack vector

Credential theft via CRLF memcache command injection

Published Apr 20, 2022 · Updated Aug 4, 2026

Memcache command injection in Zimbra Collaboration 8.8.15 and 9.0 allows remote attackers to steal cleartext account credentials. The reverse proxy places URL-derived usernames into line-oriented Memcached lookups without escaping CRLF, so injected commands can poison predictable route keys. Default configurations are exposed without authentication or user interaction; a victim's next IMAP or POP3 login sends cleartext credentials to an attacker-controlled server.

CVSS severity7.5
High
EPSS probability85.40%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memcache command injection in Zimbra Collaboration 8.8.15 and 9.0 allows remote attackers to steal cleartext account credentials. The reverse proxy places URL-derived usernames into line-oriented Memcached lookups without escaping CRLF, so injected commands can poison predictable route keys. Default configurations are exposed without authentication or user interaction; a victim's next IMAP or POP3 login sends cleartext credentials to an attacker-controlled server.

The record

CVE
CVE-2022-27924
Published
Apr 20, 2022
Updated
Aug 4, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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