Is CVE-2017-9525 in the CISA KEV catalog?

No. CVE-2017-9525 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-9525?

CVE-2017-9525 has a CVSS v3 base score of 6.7 (MEDIUM).

What is the EPSS score for CVE-2017-9525?

CVE-2017-9525 has an EPSS score of 0.55% (42th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-9525?

Upgrade cron on debian 11 to 3.0pl1-129 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2017-9525

MEDIUM

6.7

CVSS v3

NVD

Description

In the cron package through 3.0pl1-128 on Debian, and through 3.0pl1-128ubuntu2 on Ubuntu, the postinst maintainer script allows for group-crontab-to-root privilege escalation via symlink attacks against unsafe usage of the chown and chmod programs.

CWE-59Link Following

How to fix

Remediation Available

cronDebian

Fixed in:3.0pl1-129CVE-2017-9525

cronUbuntu

Fixed in:3.0pl1-128ubuntu2+esm1USN-5259-1

Fixed in:3.0pl1-128ubuntu2+esm2USN-5259-3

Fixed in:3.0pl1-128.1ubuntu1.1USN-5259-2

Fixed in:3.0pl1-128.1ubuntu1.2USN-5259-3

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.55%probability of exploitation in 30 days

42ndpercentile

Moderate risk: more likely to be exploited than 42% of all known CVEs.

References

Vendor Advisory1

bugs.debian.org

Third-Party Advisory4

Related Vulnerabilities

Other CWE-59 (Link Following) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-30333	High	7.5	99%	KEV + Ransom	Fix
CVE-2021-21300	High	8.0	89%	-	Fix
CVE-2021-32610	High	7.1	73%	-	Fix
CVE-2020-36193	High	7.5	71%	KEV	Fix
CVE-2023-40028	Medium	4.9	58%	-	Fix
CVE-2020-0787	High	7.8	43%	KEV + Ransom	-

Embed a live status badge for CVE-2017-9525

Markdown

[![CVE-2017-9525](https://tridentstack.com/cve/badge/CVE-2017-9525.svg)](https://tridentstack.com/cve/CVE-2017-9525)

HTML

<a href="https://tridentstack.com/cve/CVE-2017-9525"><img src="https://tridentstack.com/cve/badge/CVE-2017-9525.svg" alt="CVE-2017-9525"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.