CVE-2021-32455: SITEL CAP/PRX firmware version 5.2.01, allows an attacker with access to the device´s network to cause a denia

Routine

MEDIUM 6.8MITIGATE

CVE-2021-32455 is a medium-severity flaw (CVSS 6.8) affecting cap\/prx firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SITEL CAP/PRX firmware version 5.2.01, allows an attacker with access to the device´s network to cause a denial of service condition on the device. An attacker could exploit this vulnerability by sending HTTP requests massively.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-400
Published	2021-05-17
Last modified	2026-06-17

Publisher (CNA): Spanish National Cybersecurity Institute, S.A. (INCIBE) · Vendor: sitel-sa

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

Am I affected?

Timeline

2021-05-17 17:15 UTCPublished CVE record published
2026-06-17 03:52 UTCUpdated Record last modified

sitel-sa cap\/prx firmware MITIGATE

Affected: 5.2.01

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2.01

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2021-32455?

cap\/prx firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-32455 being exploited?

CVE-2021-32455 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-2021-32455 affect?

CVE-2021-32455 affects cap\/prx firmware. Severity is medium (CVSS 6.8). SITEL CAP/PRX firmware version 5.2.01, allows an attacker with access to the device´s network to cause a denial of service condition on the device. An attacker could exploit this vulnerability by sending HTTP requests massively.

How urgent is CVE-2021-32455?

Priority 31/100. No elevated risk signals yet.

Related CVEs

CVE-2021-32453 MEDIUM 6.5 MITIGATE SITEL CAP/PRX firmware version 5.2.01 allows an attacker with access to the local network, to access via HTTP

References

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