CVE-2020-22570Public exploitNetwork attack vector

Daemon crash via uninitialized meta-command error pointer

Published Aug 22, 2023 · Updated Oct 3, 2024

NULL pointer dereference in memcached 1.6.0 through 1.6.2 allows remote attackers to crash the daemon via a crafted meta command. In process_mget_command, an early _meta_flag_preparse failure can leave errstr uninitialized before the error response reads through that pointer. Network access to the memcached command port is sufficient, and successful exploitation interrupts the caching service without reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability1.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in memcached 1.6.0 through 1.6.2 allows remote attackers to crash the daemon via a crafted meta command. In process_mget_command, an early _meta_flag_preparse failure can leave errstr uninitialized before the error response reads through that pointer. Network access to the memcached command port is sufficient, and successful exploitation interrupts the caching service without reported data disclosure or modification.

The record

CVE
CVE-2020-22570
Published
Aug 22, 2023
Updated
Oct 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 2024Record 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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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 exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1499.004Application or System Exploitation

Public exploit references

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

Technologies

Your stack

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Your stack

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