CVE-2020-7054Public exploitNetwork attack vector

Process crash via unchecked MMS bit-string offset

Published Jan 14, 2020 · Updated Aug 4, 2024

Heap-based buffer overflow in libIEC61850 1.4.0 and earlier allows remote attackers to corrupt heap memory via crafted MMS bit strings. MmsValue_decodeMmsData fails to validate bufPos before copying from buffer plus bufPos plus one, causing a write past a heap allocation. User interaction is required for an application to process attacker-controlled MMS data, and the demonstrated consequence is a process abort.

CVSS severity8.8
High
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in libIEC61850 1.4.0 and earlier allows remote attackers to corrupt heap memory via crafted MMS bit strings. MmsValue_decodeMmsData fails to validate bufPos before copying from buffer plus bufPos plus one, causing a write past a heap allocation. User interaction is required for an application to process attacker-controlled MMS data, and the demonstrated consequence is a process abort.

The record

CVE
CVE-2020-7054
Published
Jan 14, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2020CVE 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

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

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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-787Out-of-bounds Write

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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