CVE-2023-28793

Code injection via signelf buffer overflow

Published Oct 23, 2023 · Updated Feb 27, 2025

Buffer overflow in the signelf library in Zscaler Client Connector for Linux before 1.3.1.6 allows local users to inject code. Public records identify the signelf library and inter-process communication hardening, but do not disclose the specific buffer operation or input that exceeds its bounds. Local low-privilege access is required, and successful exploitation can execute code within the affected process and compromise its data or availability.

CVSS severity7.8
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the signelf library in Zscaler Client Connector for Linux before 1.3.1.6 allows local users to inject code. Public records identify the signelf library and inter-process communication hardening, but do not disclose the specific buffer operation or input that exceeds its bounds. Local low-privilege access is required, and successful exploitation can execute code within the affected process and compromise its data or availability.

The record

CVE
CVE-2023-28793
Published
Oct 23, 2023
Updated
Feb 27, 2025
Vendor
Zscaler
Product
Zscaler Client Connector
Classifications
CWE-787, CWE-94, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 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=0 <1.3.1.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Zscaler · Zscaler Client Connectorversion=0 <1.3.1.6

Published CVSS scores

7.8Zscaler, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-94Improper Control of Generation of Code ('Code Injection')
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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