CVE-2020-12080Public exploitNetwork attack vector

License server crash via oversized quorum allocation

Published Sep 17, 2021 · Updated Aug 4, 2024

Denial of service in Flexera FlexNet Publisher lmadmin 11.16.6 allows remote attackers to crash the license server via a crafted message. The FLEX_MSG_QUORUM parser accepts an attacker-controlled signed 32-bit size and passes 0x7fffffff to C++ new[] without adequate validation, leaving the allocation exception unhandled. No authentication or user interaction is required; one malformed message to the listening service terminates lmadmin and interrupts license administration.

CVSS severity7.5
High
EPSS probability2.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Flexera FlexNet Publisher lmadmin 11.16.6 allows remote attackers to crash the license server via a crafted message. The FLEX_MSG_QUORUM parser accepts an attacker-controlled signed 32-bit size and passes 0x7fffffff to C++ new[] without adequate validation, leaving the allocation exception unhandled. No authentication or user interaction is required; one malformed message to the listening service terminates lmadmin and interrupts license administration.

The record

CVE
CVE-2020-12080
Published
Sep 17, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8Tenable ResearchAV:N/AC:L/Au:N/C:N/I:N/A:C
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
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-20Improper Input Validation
T1499.004Endpoint Denial of Service: Application 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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