CVE-2017-8364: The read_buf function in stream.c in rzip 2.1 allows remote attackers to cause a denial of service (heap-based

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HIGH 7.8DOWNGRADE

CVE-2017-8364 is a high-severity flaw (CVSS 7.8) affecting rzip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The read_buf function in stream.c in rzip 2.1 allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted archive.

Why this priority

High severity
Public exploit reference

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	None
User interaction	Required
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-04-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: rzip project

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

Am I affected?

Timeline

2017-04-30 19:59 UTCPublished CVE record published
2026-06-17 01:26 UTCUpdated Record last modified

rzip project rzip DOWNGRADE

Affected: 2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1 (Debian / Ubuntu)

apt-cache madison rzip sudo apt install rzip=<VERSION_BEFORE_2.1> sudo apt-mark hold rzip

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

dnf --showduplicates list rzip sudo dnf downgrade rzip-<VERSION_BEFORE_2.1> sudo dnf versionlock add rzip

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-2017-8364?

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

Is CVE-2017-8364 being exploited?

CVE-2017-8364 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-2017-8364 affect?

CVE-2017-8364 affects rzip. Severity is high (CVSS 7.8). The read_buf function in stream.c in rzip 2.1 allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted archive.

How urgent is CVE-2017-8364?

Priority 52/100. High severity; Public exploit reference

References

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