CVE-2020-14397Network attack vector

Unauthenticated server crash via unchecked region spans

Published Jun 17, 2020 · Updated Aug 4, 2024

NULL pointer dereference in LibVNCServer before 0.9.13 allows remote attackers to crash a VNC server through crafted network input. The sraSpanInsertAfter, sraSpanInsertBefore, and sraSpanRemove helpers dereference span arguments without first checking for NULL. Network access without authentication reaches the affected server path, and successful exploitation interrupts only that service.

CVSS severity7.5
High
EPSS probability3.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in LibVNCServer before 0.9.13 allows remote attackers to crash a VNC server through crafted network input. The sraSpanInsertAfter, sraSpanInsertBefore, and sraSpanRemove helpers dereference span arguments without first checking for NULL. Network access without authentication reaches the affected server path, and successful exploitation interrupts only that service.

The record

CVE
CVE-2020-14397
Published
Jun 17, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499
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

5.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST National Vulnerability DatabaseCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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