CVE-2021-46496

Denial of service via Jsi_ObjFree use-after-free

Published Jan 27, 2022 · Updated Aug 4, 2024

Heap-use-after-free in Jsish 3.5.0 allows local users to interrupt service through a crafted execution path reaching Jsi_ObjFree. The Jsi_ObjFree routine releases heap storage that subsequent execution accesses again, producing use-after-free behavior and a denial-of-service condition. Exploitation requires local execution with user interaction; published evidence does not show confidentiality or integrity impact, remote reachability, or exploitation in the wild.

CVSS severity5.5
Medium
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-use-after-free in Jsish 3.5.0 allows local users to interrupt service through a crafted execution path reaching Jsi_ObjFree. The Jsi_ObjFree routine releases heap storage that subsequent execution accesses again, producing use-after-free behavior and a denial-of-service condition. Exploitation requires local execution with user interaction; published evidence does not show confidentiality or integrity impact, remote reachability, or exploitation in the wild.

The record

CVE
CVE-2021-46496
Published
Jan 27, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2022CVE 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 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-416Use After Free

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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