CVE-2021-30048: Directory Traversal in the fileDownload function in com/java2nb/common/controller/FileController.java in Novel

This week

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2021-30048 is a medium-severity flaw (CVSS 5.3) affecting novel boutique house-plus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory Traversal in the fileDownload function in com/java2nb/common/controller/FileController.java in Novel-plus (小说精品屋-plus) 3.5.1 allows attackers to read arbitrary files via the filePath parameter.

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	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-22
Published	2021-04-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: novel boutique house-plus project

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

Am I affected?

Timeline

2021-04-29 17:15 UTCPublished CVE record published
2026-06-17 03:49 UTCUpdated Record last modified

novel boutique house-plus project novel boutique house-plus DOWNGRADE

Affected: 3.5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5.1

1. Check installed version

apt-cache policy novel-boutique-house-plus || rpm -q novel-boutique-house-plus || novel-boutique-house-plus --version

2. No fixed release: DOWNGRADE to a release before 3.5.1 (Debian / Ubuntu)

apt-cache madison novel-boutique-house-plus sudo apt install novel-boutique-house-plus=<VERSION_BEFORE_3.5.1> sudo apt-mark hold novel-boutique-house-plus

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

dnf --showduplicates list novel-boutique-house-plus sudo dnf downgrade novel-boutique-house-plus-<VERSION_BEFORE_3.5.1> sudo dnf versionlock add novel-boutique-house-plus

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-2021-30048?

novel boutique house-plus: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-30048 being exploited?

CVE-2021-30048 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-2021-30048 affect?

CVE-2021-30048 affects novel boutique house-plus. Severity is medium (CVSS 5.3). Directory Traversal in the fileDownload function in com/java2nb/common/controller/FileController.java in Novel-plus (小说精品屋-plus) 3.5.1 allows attackers to read arbitrary files via the filePath parameter.

How urgent is CVE-2021-30048?

Priority 49/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

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References

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