What is CVE-2021-38490?

CVE-2021-38490 is a high-severity vulnerability in Altova Mobiletogether Server, classified under Improper Restriction of Recursive Entity References in DTDs (XML Entity Expansion). CVSS score: 7.5/10. Published 2021-08-10.

How severe is CVE-2021-38490?

High severity. CVSS v3 base score is 7.5 out of 10.

XXE in Altova Mobiletogether Server

CVE-2021-38490

Altova MobileTogether Server before 7.3 SP1 allows XML exponential entity expansion, a different vulnerability than CVE-2021-37425.

Published 2021-08-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.3th percentile), scored 2026-10-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 62.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Altova Mobiletogether Server — versions 7.3

Weakness classification (CWE)

CWE-776 — Improper Restriction of Recursive Entity References in DTDs (XML Entity Expansion)

References

www.redteam-pentesting.de/advisories/rt-sa-2021-002 (Not Applicable)

Frequently asked questions

What is CVE-2021-38490?: CVE-2021-38490 is a high-severity vulnerability in Altova Mobiletogether Server, classified under Improper Restriction of Recursive Entity References in DTDs (XML Entity Expansion). CVSS score: 7.5/10. Published 2021-08-10.
How severe is CVE-2021-38490?: High severity. CVSS v3 base score is 7.5 out of 10.