CVE-2017-13674: Symantec ProxyClient 3.4 for Windows is susceptible to a privilege escalation vulnerability

Routine

HIGH 7.8DOWNGRADE

CVE-2017-13674 is a high-severity flaw (CVSS 7.8) affecting proxyclient. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Symantec ProxyClient 3.4 for Windows is susceptible to a privilege escalation vulnerability. A malicious local Windows user can, under certain circumstances, exploit this vulnerability to escalate their privileges on the system and execute arbitrary code with LocalSystem privileges.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Published	2017-09-01
Last modified	2026-06-17

Publisher (CNA): Symantec Corporation · Vendor: symantec

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-09-01 13:29 UTCPublished CVE record published
2026-06-17 01:04 UTCUpdated Record last modified

symantec proxyclient DOWNGRADE

Affected: 3.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.4

1. Check installed version

apt-cache policy proxyclient || rpm -q proxyclient || proxyclient --version

2. No fixed release: DOWNGRADE to a release before 3.4 (Debian / Ubuntu)

apt-cache madison proxyclient sudo apt install proxyclient=<VERSION_BEFORE_3.4> sudo apt-mark hold proxyclient

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list proxyclient sudo dnf downgrade proxyclient-<VERSION_BEFORE_3.4> sudo dnf versionlock add proxyclient

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-13674?

proxyclient: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-13674 being exploited?

CVE-2017-13674 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-13674 affect?

CVE-2017-13674 affects proxyclient. Severity is high (CVSS 7.8). Symantec ProxyClient 3.4 for Windows is susceptible to a privilege escalation vulnerability. A malicious local Windows user can, under certain circumstances, exploit this vulnerability to escalate their privileges on the system and execute

How urgent is CVE-2017-13674?

Priority 37/100. High severity

Software pages

Windows vulnerabilities · Symantec and Broadcom vulnerabilities

Related CVEs

CVE-2015-1454 HIGH 7.1 UPGRADE UPGRADE Blue Coat ProxyClient before 3.3.3.3 and 3.4.x before 3.4.4.10 and Unified Agent before 4.1.3.151952 does not

References

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