CVE-2023-49102: NZBGet 21.1 allows authenticated remote code execution because the unarchive programs (7za and unrar) preserve

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HIGH 8.8DOWNGRADE

CVE-2023-49102 is a high-severity flaw (CVSS 8.8) affecting nzbget. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NZBGet 21.1 allows authenticated remote code execution because the unarchive programs (7za and unrar) preserve executable file permissions. An attacker with the Control capability can execute a file by setting the value of SevenZipCommand or UnrarCmd. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Published	2023-11-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nzbget

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

Am I affected?

Timeline

2023-11-22 22:15 UTCPublished CVE record published
2026-06-17 06:35 UTCUpdated Record last modified

nzbget nzbget DOWNGRADE

Affected: 21.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 21.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 21.1 (Debian / Ubuntu)

apt-cache madison nzbget sudo apt install nzbget=<VERSION_BEFORE_21.1> sudo apt-mark hold nzbget

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

dnf --showduplicates list nzbget sudo dnf downgrade nzbget-<VERSION_BEFORE_21.1> sudo dnf versionlock add nzbget

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-2023-49102?

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

Is CVE-2023-49102 being exploited?

CVE-2023-49102 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-2023-49102 affect?

CVE-2023-49102 affects nzbget. Severity is high (CVSS 8.8). NZBGet 21.1 allows authenticated remote code execution because the unarchive programs (7za and unrar) preserve executable file permissions. An attacker with the Control capability can execute a file by setting the value of SevenZipCommand o

How urgent is CVE-2023-49102?

Priority 54/100. High severity; Public exploit reference

Related CVEs

CVE-2008-2266 MEDIUM 4.4 UPGRADE DOWNGRADE uulib/uunconc.c in UUDeview 0.5.20, as used in nzbget before 0.3.0 and possibly other products, allows local u

References

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