CVE-2022-39377

Remote code execution via unchecked allocation multiplication

Published Nov 8, 2022 · Updated Nov 3, 2025

A buffer overflow in Sysstat 9.1.16 through 12.7.0 allows local users to execute code via crafted activity data files. The allocate_structures function in sa_common.c multiplies activity-size fields without overflow checks before SREALLOC sizes the buffers, producing an undersized allocation on 32-bit systems. Exploitation requires a user to cause sysstat to display attacker-controlled activity data; successful exploitation can provide code execution, while the advisory does not establish a remote network path.

CVSS severity7.8
High
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A buffer overflow in Sysstat 9.1.16 through 12.7.0 allows local users to execute code via crafted activity data files. The allocate_structures function in sa_common.c multiplies activity-size fields without overflow checks before SREALLOC sizes the buffers, producing an undersized allocation on 32-bit systems. Exploitation requires a user to cause sysstat to display attacker-controlled activity data; successful exploitation can provide code execution, while the advisory does not establish a remote network path.

The record

CVE
CVE-2022-39377
Published
Nov 8, 2022
Updated
Nov 3, 2025
Vendor
Sysstat
Product
Sysstat
Classifications
CWE-131, CWE-120, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 8, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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=>= 9.1.16, < 12.7.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Sysstat · Sysstatversion=>= 9.1.16, < 12.7.1

Published CVSS scores

7.0GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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