The XML parser used in ConeXware PowerArchiver before 20.10.02 allows processing of external entities, which might lead to exfiltration of…

published 2021-06-21 5y ago modified 2026-06-17 4mo ago also EUVD-2021-15341

cvss: 4.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits: 0; none known

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).

Patch / fix

fixed in 1

powerarchiver powerarchiver 20.10.02

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Exploit prediction

0.92% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

peterka.tech https://peterka.tech/blog/posts/cve-2021-28684/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness

CWE-611 Improper Restriction of XML External Entity Reference

References

peterka.tech /blog/posts/cve-2021-28684/
exploit, third-party-advisory
powerarchiver.com
product

Sources

CVE List CVE-2021-28684
NVD CVE-2021-28684

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