Out-of-bounds write to heap in pacparser

published 2024-05-02 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-32433

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits: 0; none known

An out-of-bounds write to heap in the pacparser library on Zscaler Client Connector on Mac may lead to arbitrary code execution.

Patch / fix

fixed in 2

Zscaler Client Connector 3.7.0.172
zscaler client_connector 3.7.0.172

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-05-02)

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Zscaler Client Connector
zscaler client_connector

Classification

Weakness

CWE-122 Heap-based Buffer Overflow
CWE-787 Out-of-bounds Write

References

help.zscaler.com /client-connector/client-connector-app-release-summary-2022?applicable_category=macOS&applicable_version=3.7&d
release-notes, vendor-advisory

Sources

CVE List CVE-2023-28798
NVD CVE-2023-28798

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary