CVE-2021-31577Network attack vector

Unauthenticated privilege escalation via missing permission check

Published Feb 6, 2023 · Updated Aug 3, 2024

Improper authorization in Boa for MediaTek EN7528 and EN7580 before TLM7.3.275.0-64 allows remote attackers to escalate privileges. Boa omits a required permission check, but MediaTek has not disclosed the affected request handler, protected operation, or granted privilege. Network proximity is required, but no existing execution privilege or user interaction is needed; MediaTek has not specified the resulting privilege level.

CVSS severity9.8
Critical
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Boa for MediaTek EN7528 and EN7580 before TLM7.3.275.0-64 allows remote attackers to escalate privileges. Boa omits a required permission check, but MediaTek has not disclosed the affected request handler, protected operation, or granted privilege. Network proximity is required, but no existing execution privilege or user interaction is needed; MediaTek has not specified the resulting privilege level.

The record

CVE
CVE-2021-31577
Published
Feb 6, 2023
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-862, T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2023CVE 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?

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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1068Exploitation for Privilege Escalation

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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