CVE-2020-14400Network attack vector

Service crash via unaligned uint16 access

Published Jun 17, 2020 · Updated Aug 4, 2024

A memory-alignment issue in LibVNCServer before 0.9.13 allows remote attackers to cause service interruption via byte-aligned data accessed through uint16_t pointers. The libvncserver/translate.c code reads byte-aligned data through uint16_t pointers, an operation that can fault on architectures requiring alignment. The record is disputed because third parties report no known exploitable path or trust-boundary crossing.

CVSS severity7.5
High
EPSS probability2.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory-alignment issue in LibVNCServer before 0.9.13 allows remote attackers to cause service interruption via byte-aligned data accessed through uint16_t pointers. The libvncserver/translate.c code reads byte-aligned data through uint16_t pointers, an operation that can fault on architectures requiring alignment. The record is disputed because third parties report no known exploitable path or trust-boundary crossing.

The record

CVE
CVE-2020-14400
Published
Jun 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 17, 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

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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

No sourced classifications are available.

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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