How severe is CVE-2017-7549?

CVE-2017-7549 has a CVSS score of 6.4/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2017-7549?

CVE-2017-7549 affects the following packages: instack-undercloud (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2017-7549?

The records we use list no patched version of instack-undercloud for CVE-2017-7549. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

How do I detect CVE-2017-7549 in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for instack-undercloud, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2017-7549 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2017-7549 actively exploited in the wild?

No public exploit code has been indexed for CVE-2017-7549 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2017-7549?

CVE-2017-7549 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 29th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2017-7549?

CVE-2017-7549 is classified as CWE-377 (CWE-377), CWE-59 (CWE-59). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2017-7549 published, and has it been updated?

CVE-2017-7549 was published on September 21, 2017 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍

🐍 PyPI

Not in CISA KEV

MEDIUM severity

CVE-2017-7549 — instack-undercloud

MEDIUM

CVE-2017-7549 is a medium-severity (CVSS 6.4) CWE-377 vulnerability in instack-undercloud. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

instack-undercloud vulnerable to symlink attack on tmp files

Also known asGHSA-53wm-97p6-582fPYSEC-2017-152PYSEC-2026-645

Published

Sep 21, 2017

Updated

Oct 24, 2026

Affected

1 pkg

Patched

See advisory

Exploits

None indexed

Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs29th percentile — riskier than 29% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐍instack-undercloud

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

A flaw was found in instack-undercloud 7.2.0 as packaged in Red Hat OpenStack Platform Pike, 6.1.0 as packaged in Red Hat OpenStack Platform Oacta, 5.3.0 as packaged in Red Hat OpenStack Newton, where pre-install and security policy scripts used insecure temporary files. A local user could exploit this flaw to conduct a symbolic-link attack, allowing them to overwrite the contents of arbitrary files.

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`instack-undercloud`	all versions	No fix

Affected Products

1 product · 3 configurations

Application

instack-undercloudopenstack

3 versions

5.3.06.1.07.2.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for instack-undercloud, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
The records we use list no patched version of instack-undercloud for CVE-2017-7549. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Product	Fixed in	Advisory
Red Hat Enterprise Linux OpenStack Platform director 7.0 for RHEL 7	`instack-undercloud-0:2.1.2-41.el7ost`	RHSA-2017:2693
Red Hat OpenStack Platform 10.0 (Newton)	`instack-undercloud-0:5.3.0-3.el7ost`	RHSA-2017:2649
Red Hat OpenStack Platform 11.0 (Ocata)	`instack-undercloud-0:6.1.0-3.el7ost`	RHSA-2017:2726
Red Hat OpenStack Platform 8.0 (Liberty) director	`instack-undercloud-0:2.2.7-10.el7ost`	RHSA-2017:2687
Red Hat OpenStack Platform 9.0 (Mitaka) director	`instack-undercloud-0:4.0.0-17.el7ost`	RHSA-2017:2557

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2017-7549 in your dependencies?

Find it across PyPI, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.4/10CVSS v3 base

Vector breakdown

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

None

Raw vector

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

CWE Classification

CWE-377CWE-377 CWE-59CWE-59

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Sep 21, 2017

Last updated

Oct 24, 2026

Identifiers

CVE-2017-7549

GHSA-53wm-97p6-582f

PYSEC-2017-152

PYSEC-2026-645

References

Advisorysecurityfocus.com Advisoryaccess.redhat.com · RHSA 2017:2557 Advisoryaccess.redhat.com · RHSA 2017:2649 Advisoryaccess.redhat.com · RHSA 2017:2687 Advisoryaccess.redhat.com · RHSA 2017:2693 Advisoryaccess.redhat.com · RHSA 2017:2726 Advisorynvd.nist.gov · CVE 2017 7549 Reportbugzilla.redhat.com · show bug.cgi Webaccess.redhat.com · CVE 2017 7549 Webgithub.com · PYSEC 2017 152.yaml Webopendev.org · instack undercloud Webweb.archive.org

Related vulnerabilities

This CVE is medium severity; 6 of 8 other CVEs with CWE-377 are rated as high or higher (top: high).

CVE-2026-113713CVE-2026-64672CVE-2026-62847CVE-2026-106451CVE-2026-55086CVE-2026-35342CVE-2026-53759CVE-2026-46406Browse all CWE-377

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026