CVE-2020-23040: Sky File v2.1.0 contains a directory traversal vulnerability in the FTP server which allows attackers to acces

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-23040 is a high-severity flaw (CVSS 7.5) affecting sky file. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sky File v2.1.0 contains a directory traversal vulnerability in the FTP server which allows attackers to access sensitive data and files via 'null' path commands.

Why this priority

High severity
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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 22%)
CISA exploited list	No
Weakness	CWE-22
Published	2021-10-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sky file project

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

Am I affected?

Timeline

2021-10-22 20:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

sky file project sky file DOWNGRADE

Affected: 2.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.0

1. Check installed version

apt-cache policy sky-file || rpm -q sky-file || sky-file --version

2. No fixed release: DOWNGRADE to a release before 2.1.0 (Debian / Ubuntu)

apt-cache madison sky-file sudo apt install sky-file=<VERSION_BEFORE_2.1.0> sudo apt-mark hold sky-file

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

dnf --showduplicates list sky-file sudo dnf downgrade sky-file-<VERSION_BEFORE_2.1.0> sudo dnf versionlock add sky-file

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-2020-23040?

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

Is CVE-2020-23040 being exploited?

CVE-2020-23040 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-2020-23040 affect?

CVE-2020-23040 affects sky file. Severity is high (CVSS 7.5). Sky File v2.1.0 contains a directory traversal vulnerability in the FTP server which allows attackers to access sensitive data and files via 'null' path commands.

How urgent is CVE-2020-23040?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-36488 MEDIUM 6.5 DOWNGRADE An issue in the FTP server of Sky File v2.1.0 allows attackers to perform directory traversal via `/null//` pa

References

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