CVE-2021-28684: The XML parser used in ConeXware PowerArchiver before 20.10.02 allows processing of external entities, which m

Q: How do I fix CVE-2021-28684?

powerarchiver: upgrade to 20.10.02. Exact commands for each OS are on this page.

Q: Is CVE-2021-28684 being exploited?

CVE-2021-28684 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-2021-28684 affect?

CVE-2021-28684 affects powerarchiver. Severity is medium (CVSS 4.3). The XML parser used in ConeXware PowerArchiver before 20.10.02 allows processing of external entities, which might lead to exfiltration of local files over the network (via an XXE attack).

Q: How urgent is CVE-2021-28684?

Priority 35/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADE

CVE-2021-28684 is a medium-severity flaw (CVSS 4.3) affecting powerarchiver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The XML parser used in ConeXware PowerArchiver before 20.10.02 allows processing of external entities, which might lead to exfiltration of local files over the network (via an XXE attack).

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-611
Published	2021-06-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: powerarchiver

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

Am I affected?

Timeline

2021-06-21 13:15 UTCPublished CVE record published
2026-06-17 03:46 UTCUpdated Record last modified

powerarchiver powerarchiver UPGRADE

Affected: < 20.10.02

Fixed in: 20.10.02

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 20.10.02 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade powerarchiver

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-2021-28684?

powerarchiver: upgrade to 20.10.02. Exact commands for each OS are on this page.

Is CVE-2021-28684 being exploited?

CVE-2021-28684 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-2021-28684 affect?

CVE-2021-28684 affects powerarchiver. Severity is medium (CVSS 4.3). The XML parser used in ConeXware PowerArchiver before 20.10.02 allows processing of external entities, which might lead to exfiltration of local files over the network (via an XXE attack).

How urgent is CVE-2021-28684?

Priority 35/100. Public exploit reference

Related CVEs

CVE-2014-2319 MEDIUM 5.0 UPGRADE The Encrypt Files feature in ConeXware PowerArchiver before 14.02.05 uses legacy ZIP encryption even if the AE

References

← Back to latest CVEs