CVE-2015-9275: ARC 5.21q allows directory traversal via a full pathname in an archive file.

This week

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2015-9275 is a medium-severity flaw (CVSS 5.3) affecting arc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ARC 5.21q allows directory traversal via a full pathname in an archive file.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-22
Published	2019-01-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: arc project

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

Am I affected?

Timeline

2019-01-07 18:29 UTCPublished CVE record published
2026-06-17 00:36 UTCUpdated Record last modified

arc project arc DOWNGRADE

Affected: 5.21q

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.21q

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.21q (Debian / Ubuntu)

apt-cache madison arc sudo apt install arc=<VERSION_BEFORE_5.21q> sudo apt-mark hold arc

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

dnf --showduplicates list arc sudo dnf downgrade arc-<VERSION_BEFORE_5.21q> sudo dnf versionlock add arc

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-2015-9275?

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

Is CVE-2015-9275 being exploited?

CVE-2015-9275 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-2015-9275 affect?

CVE-2015-9275 affects arc. Severity is medium (CVSS 5.3). ARC 5.21q allows directory traversal via a full pathname in an archive file.

How urgent is CVE-2015-9275?

Priority 50/100. Public exploit reference; Remotely exploitable, no login, no user action

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References

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