CVE-2024-2599: File upload restriction evasion vulnerability in AMSS++ version 4.31

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CRITICAL 9.9DOWNGRADE

CVE-2024-2599 is a critical-severity flaw (CVSS 9.9) affecting amss\+\+. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

File upload restriction evasion vulnerability in AMSS++ version 4.31. This vulnerability could allow an authenticated user to potentially obtain RCE through webshell, compromising the entire infrastructure.

Why this priority

Critical severity

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

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-434
Published	2024-03-18
Last modified	2026-06-17

Publisher (CNA): Spanish National Cybersecurity Institute, S.A. (INCIBE) · Vendor: amss\+\+ project

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

Am I affected?

Timeline

2024-03-18 14:15 UTCPublished CVE record published
2026-06-17 07:24 UTCUpdated Record last modified

amss\+\+ project amss\+\+ DOWNGRADE

Affected: 4.31

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.31

1. Check installed version

apt-cache policy amss++ || rpm -q amss++ || amss++ --version

2. No fixed release: DOWNGRADE to a release before 4.31 (Debian / Ubuntu)

apt-cache madison amss++ sudo apt install amss++=<VERSION_BEFORE_4.31> sudo apt-mark hold amss++

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

dnf --showduplicates list amss++ sudo dnf downgrade amss++-<VERSION_BEFORE_4.31> sudo dnf versionlock add amss++

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-2024-2599?

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

Is CVE-2024-2599 being exploited?

CVE-2024-2599 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-2024-2599 affect?

CVE-2024-2599 affects amss\+\+. Severity is critical (CVSS 9.9). File upload restriction evasion vulnerability in AMSS++ version 4.31. This vulnerability could allow an authenticated user to potentially obtain RCE through webshell, compromising the entire infrastructure.

How urgent is CVE-2024-2599?

Priority 47/100. Critical severity

Related CVEs

CVE-2024-2598 HIGH 7.1 DOWNGRADE Vulnerability in AMSS++ version 4.31, which does not sufficiently encode user-controlled input, resulting in a
CVE-2024-2597 HIGH 7.1 DOWNGRADE Vulnerability in AMSS++ version 4.31, which does not sufficiently encode user-controlled input, resulting in a
CVE-2024-2596 HIGH 7.1 DOWNGRADE Vulnerability in AMSS++ version 4.31, which does not sufficiently encode user-controlled input, resulting in a
CVE-2024-2595 HIGH 7.1 DOWNGRADE Vulnerability in AMSS++ version 4.31, which does not sufficiently encode user-controlled input, resulting in a
CVE-2024-2594 HIGH 7.1 DOWNGRADE Vulnerability in AMSS++ version 4.31, which does not sufficiently encode user-controlled input, resulting in a

References

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