CVE-2021-3160: Deserialization of untrusted data in the login page of ASSUWEB 359.3 build 1 subcomponent of ACA ASSUREX RENTE

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-3160 is a critical-severity flaw (CVSS 9.8) affecting assuweb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Deserialization of untrusted data in the login page of ASSUWEB 359.3 build 1 subcomponent of ACA ASSUREX RENTES product allows a remote attacker to inject unsecure serialized Java object using a specially crafted HTTP request, resulting in an unauthenticated remote code execution on the server.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.9% (top 8%)
CISA exploited list	No
Weakness	CWE-502
Published	2021-01-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: aca

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

Am I affected?

Timeline

2021-01-28 20:15 UTCPublished CVE record published
2026-06-17 04:04 UTCUpdated Record last modified

aca assuweb DOWNGRADE

Affected: 359.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 359.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 359.3 (Debian / Ubuntu)

apt-cache madison assuweb sudo apt install assuweb=<VERSION_BEFORE_359.3> sudo apt-mark hold assuweb

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

dnf --showduplicates list assuweb sudo dnf downgrade assuweb-<VERSION_BEFORE_359.3> sudo dnf versionlock add assuweb

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-2021-3160?

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

Is CVE-2021-3160 being exploited?

CVE-2021-3160 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-2021-3160 affect?

CVE-2021-3160 affects assuweb. Severity is critical (CVSS 9.8). Deserialization of untrusted data in the login page of ASSUWEB 359.3 build 1 subcomponent of ACA ASSUREX RENTES product allows a remote attacker to inject unsecure serialized Java object using a specially crafted HTTP request, resulting in

How urgent is CVE-2021-3160?

Priority 62/100. Critical severity; EPSS top 8%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

References

← Back to latest CVEs