CVE-2021-25277: FTAPI 4.0 - 4.10 allows XSS via a crafted filename to the alternative text hover box in the file submission co

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MEDIUM 6.1UPGRADE

CVE-2021-25277 is a medium-severity flaw (CVSS 6.1) affecting ftapi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FTAPI 4.0 - 4.10 allows XSS via a crafted filename to the alternative text hover box in the file submission component.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-03-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ftapi

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

Am I affected?

Timeline

2021-03-19 17:15 UTCPublished CVE record published
2026-06-17 03:41 UTCUpdated Record last modified

ftapi ftapi UPGRADE

Affected: >= 4.0 and <= 4.10

Fixed in: newer than 4.10

Safe to downgrade to: a release before 4.0

1. Check installed version

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

2. UPGRADE to newer than 4.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ftapi

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ftapi

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison ftapi sudo apt install ftapi=<VERSION_BEFORE_4.0> sudo apt-mark hold ftapi

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ftapi sudo dnf downgrade ftapi-<VERSION_BEFORE_4.0> sudo dnf versionlock add ftapi

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-2021-25277?

ftapi: upgrade to newer than 4.10. Exact commands for each OS are on this page.

Is CVE-2021-25277 being exploited?

CVE-2021-25277 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-2021-25277 affect?

CVE-2021-25277 affects ftapi. Severity is medium (CVSS 6.1). FTAPI 4.0 - 4.10 allows XSS via a crafted filename to the alternative text hover box in the file submission component.

How urgent is CVE-2021-25277?

Priority 41/100. Public exploit reference

Related CVEs

CVE-2021-25278 MEDIUM 4.8 UPGRADE FTAPI 4.0 through 4.10 allows XSS via an SVG document to the Background Image upload feature in the Submit Box

References

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