How severe is CVE-2021-38490?

CVE-2021-38490 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-38490 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38490?

CVE-2021-38490 primarily affects Altova Mobiletogether Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-38490?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-38490 published?

CVE-2021-38490 was published on 2021-08-10 and last updated on 2026-06-17.

CVE-2021-38490

CVE-2021-38490 is a high-severity vulnerability in Altova Mobiletogether Server with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-776.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-776
Affected product: Altova Mobiletogether Server
Published: 2021-08-10
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-38490?: Altova MobileTogether Server before 7.3 SP1 allows XML exponential entity expansion, a different vulnerability than CVE-2021-37425.
How severe is CVE-2021-38490?: CVE-2021-38490 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-38490 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38490?: CVE-2021-38490 primarily affects Altova Mobiletogether Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-38490?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-38490 published?: CVE-2021-38490 was published on 2021-08-10 and last updated on 2026-06-17.

References

https://www.redteam-pentesting.de/advisories/rt-sa-2021-002

Affected products (2)

cpe:2.3:a:altova:mobiletogether_server:*:*:*:*:*:*:*:*
cpe:2.3:a:altova:mobiletogether_server:7.3:-:*:*:*:*:*:*

More vulnerabilities in Altova Mobiletogether Server

CVE-2021-37425 — Critical (CVSS 9.1): Altova MobileTogether Server before 7.3 SP1 allows XXE attacks, such as an InfoSetChanges/Changes attack against…

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Other CWE-776 vulnerabilities

CVE-2019-19144 — Critical (CVSS 9.8): XML External Entity Injection vulnerability in Quantum DXi6702 2.3.0.3 (11449-53631 Build304) devices via…
CVE-2022-23640 — Critical (CVSS 9.8): Excel-Streaming-Reader is an easy-to-use implementation of a streaming Excel reader using Apache POI. Prior to…
CVE-2014-2228 — Critical (CVSS 9.8): The XStream extension in HP Fortify SCA before 2.2 RC3 allows remote attackers to execute arbitrary code via unsafe…
CVE-2013-4335 — Critical (CVSS 9.8): opOpenSocialPlugin 0.8.2.1, > 0.9.9.2, 0.9.13, 1.2.6: Multiple XML External Entity Injection Vulnerabilities
CVE-2021-23926 — Critical (CVSS 9.1): The XML parsers used by XMLBeans up to version 2.6.0 did not set the properties needed to protect the user from…
CVE-2020-24590 — Critical (CVSS 9.1): The Management Console in WSO2 API Manager through 3.1.0 and API Microgateway 2.2.0 allows XML Entity Expansion attacks.

Browse all CWE-776 vulnerabilities →