CVE-2020-15591: fexsrv in F*EX (aka Frams' Fast File EXchange) before fex-20160919_2 allows eval injection (for unauthenticate

Q: How do I fix CVE-2020-15591?

frams\' fast file exchange: upgrade to 20160919_2. Exact commands for each OS are on this page.

Q: Is CVE-2020-15591 being exploited?

CVE-2020-15591 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-15591 affect?

CVE-2020-15591 affects frams\' fast file exchange. Severity is critical (CVSS 9.8). fexsrv in F*EX (aka Frams' Fast File EXchange) before fex-20160919_2 allows eval injection (for unauthenticated remote code execution).

Q: How urgent is CVE-2020-15591?

Priority 67/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2020-15591 is a critical-severity flaw (CVSS 9.8) affecting frams\' fast file exchange. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

fexsrv in F*EX (aka Frams' Fast File EXchange) before fex-20160919_2 allows eval injection (for unauthenticated remote code execution).

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.1% (top 9%)
CISA exploited list	No
Weakness	CWE-94
Published	2022-03-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: uni-stuttgart

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

Am I affected?

Timeline

2022-03-17 16:15 UTCPublished CVE record published
2026-06-17 02:56 UTCUpdated Record last modified

uni-stuttgart frams\' fast file exchange UPGRADE

Affected: < 20160919_2

Fixed in: 20160919_2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy frams-fast-file-exchange || rpm -q frams-fast-file-exchange || frams-fast-file-exchange --version

2. UPGRADE to 20160919_2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade frams-fast-file-exchange

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade frams-fast-file-exchange

Note

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

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-2020-15591?

frams\' fast file exchange: upgrade to 20160919_2. Exact commands for each OS are on this page.

Is CVE-2020-15591 being exploited?

CVE-2020-15591 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-2020-15591 affect?

CVE-2020-15591 affects frams\' fast file exchange. Severity is critical (CVSS 9.8). fexsrv in F*EX (aka Frams' Fast File EXchange) before fex-20160919_2 allows eval injection (for unauthenticated remote code execution).

How urgent is CVE-2020-15591?

Priority 67/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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