CVE-2022-30787Known exploitationPublic exploit

Heap memory disclosure via negative directory offset

Published May 26, 2022 · Updated Aug 3, 2024

Integer underflow in NTFS-3G through 2021.8.22 allows local users to read heap memory through crafted directory-read offsets. The fuse_lib_readdir handler accepts a negative offset and computes dh->contents + off, causing the reply to begin before the allocated directory buffer. Reachability requires libfuse-lite or libfuse2 and attacker-controlled FUSE requests; the disclosed addresses support ASLR defeat in a local privilege-escalation chain.

CVSS severity6.7
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in NTFS-3G through 2021.8.22 allows local users to read heap memory through crafted directory-read offsets. The fuse_lib_readdir handler accepts a negative offset and computes dh->contents + off, causing the reply to begin before the allocated directory buffer. Reachability requires libfuse-lite or libfuse2 and attacker-controlled FUSE requests; the disclosed addresses support ASLR defeat in a local privilege-escalation chain.

The record

CVE
CVE-2022-30787
Published
May 26, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-191, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 26, 2022CVE publishedPublication date reported by the CVE source.
  2. Jun 7, 2022Exploitation reportedHelp-to-Heap SUID privilege-escalation chain
  3. Aug 3, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/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)
Vectorlocal
Privilegesadmin
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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