What is CVE-2021-22338?

CVE-2021-22338 is a medium-severity vulnerability in Huawei Ecns280, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 5.3/10. Published 2021-06-29.

How severe is CVE-2021-22338?

Medium severity. CVSS v3 base score is 5.3 out of 10.

XXE in Huawei Ecns280

CVE-2021-22338

There is an XXE injection vulnerability in eCNS280 V100R005C00 and V100R005C10. A module does not perform the strict operation to the input XML message. Attacker can send specific message to exploit this vulnerability, leading to the module denial of service.

Vulnerability class: XXE (XML External Entity)

Published 2021-06-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.006 (48.4th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Huawei Ecns280
Huawei Ecns280 Firmware — versions v100r005c00, v100r005c10
Ecns280 — versions V100R005C00,V100R005C10

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

www.huawei.com/en/psirt/security-advisories/huawei-sa-20210421-01-cgp-en (Vendor Advisory)

Frequently asked questions

What is CVE-2021-22338?: CVE-2021-22338 is a medium-severity vulnerability in Huawei Ecns280, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 5.3/10. Published 2021-06-29.
How severe is CVE-2021-22338?: Medium severity. CVSS v3 base score is 5.3 out of 10.