CVE-2020-8859Network attack vector

Unauthenticated server crash via crafted drop-count parameter

Published Mar 23, 2020 · Updated Aug 4, 2024

Null pointer dereference in ELOG Electronic Logbook 3.1.4-283534d allows remote attackers to crash the server via a crafted HTTP request. The show_uploader_json path processes a crafted drop-count HTTP parameter and dereferences a null pointer. No authentication or user interaction is required, and successful exploitation interrupts the logbook service without reported data exposure or modification.

CVSS severity5.3
Medium
EPSS probability3.57%
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 ELOG Electronic Logbook 3.1.4-283534d allows remote attackers to crash the server via a crafted HTTP request. The show_uploader_json path processes a crafted drop-count HTTP parameter and dereferences a null pointer. No authentication or user interaction is required, and successful exploitation interrupts the logbook service without reported data exposure or modification.

The record

CVE
CVE-2020-8859
Published
Mar 23, 2020
Updated
Aug 4, 2024
Vendor
ELOG
Product
ELOG Electronic Logbook
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.1.4-283534d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ELOG · ELOG Electronic Logbookversion=3.1.4-283534d

Published CVSS scores

5.3Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV: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

CWE-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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