CVE-2021-23218Network attack vector

Service interruption via FIPS TLS memory leak

Published Jan 10, 2022 · Updated Aug 3, 2024

A memory leak in Mirantis Container Runtime 20.10.8 allows remote attackers to interrupt service through TLS handshakes. The FIPS-enabled TLS handshake path fails to release memory consumed while processing handshakes, although Mirantis has not identified the affected function or allocation. FIPS mode is not enabled by default, and repeated unauthenticated handshakes can progressively exhaust runtime memory and degrade or halt service.

CVSS severity5.3
Medium
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory leak in Mirantis Container Runtime 20.10.8 allows remote attackers to interrupt service through TLS handshakes. The FIPS-enabled TLS handshake path fails to release memory consumed while processing handshakes, although Mirantis has not identified the affected function or allocation. FIPS mode is not enabled by default, and repeated unauthenticated handshakes can progressively exhaust runtime memory and degrade or halt service.

The record

CVE
CVE-2021-23218
Published
Jan 10, 2022
Updated
Aug 3, 2024
Vendor
Mirantis
Product
Mirantis Container Runtime
Classifications
CWE-401, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20.10.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mirantis · Mirantis Container Runtimeversion=20.10.8

Published CVSS scores

5.3MirantisCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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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