CVE-2021-35342Network attack vector

Post-logout access via cached JWT non-invalidation

Published Aug 27, 2021 · Updated Aug 4, 2024

Authentication bypass in Northern.tech Mender Enterprise 2.6.0 and 2.7.0 allows remote authenticated users to retain backend access. The useradm JWT verification cache does not invalidate a cached token at logout, so subsequent API requests continue to pass authentication. The flaw is reachable only when JWT verification caching is enabled and preserves the token holder’s existing access after logout.

CVSS severity7.5
High
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Northern.tech Mender Enterprise 2.6.0 and 2.7.0 allows remote authenticated users to retain backend access. The useradm JWT verification cache does not invalidate a cached token at logout, so subsequent API requests continue to pass authentication. The flaw is reachable only when JWT verification caching is enabled and preserves the token holder’s existing access after logout.

The record

CVE
CVE-2021-35342
Published
Aug 27, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-613, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesauthenticated

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:H/I:N/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1078Valid Accounts

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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