CVE-2020-7852

Code execution via malformed ex.j2c file

Published Mar 24, 2021 · Updated Sep 17, 2024

Heap-based buffer overflow in HumanTalk DaviewIndy allows local users to execute arbitrary code via a malformed ex.j2c file. Daview.exe mishandles crafted ex.j2c data during file opening, causing an out-of-bounds write in heap memory; the specific parser routine is undisclosed. Exploitation requires a user to open the file, after which attacker-controlled code runs with the user's application privileges.

CVSS severity7.8
High
EPSS probability0.93%
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 HumanTalk DaviewIndy allows local users to execute arbitrary code via a malformed ex.j2c file. Daview.exe mishandles crafted ex.j2c data during file opening, causing an out-of-bounds write in heap memory; the specific parser routine is undisclosed. Exploitation requires a user to open the file, after which attacker-controlled code runs with the user's application privileges.

The record

CVE
CVE-2020-7852
Published
Mar 24, 2021
Updated
Sep 17, 2024
Vendor
HumanTalk Co., Ltd.
Product
DaviewIndy
Classifications
CWE-122, CWE-787, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=unspecified <9.0 or lower

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

HumanTalk Co., Ltd. · DaviewIndyversion=unspecified <9.0 or lower

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8KrCERT/CCCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/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.

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
T1204.002Malicious File
T1203Exploitation for Client Execution

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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