CVE-2020-9122
About
Some Huawei products have an insufficient input verification vulnerability. Attackers can exploit this vulnerability in the LAN to cause service abnormal on affected devices.Affected product versions include:HiRouter-CD30-10 version 10.0.2.5;HiRouter-CT31-10 version 10.0.2.20;WS5200-12 version 10.0.1.9;WS5281-10 version 10.0.5.10;WS5800-10 version 10.0.3.25;WS7100-10 version 10.0.5.21;WS7200-10 version 10.0.5.21.
Rainforest analyst review
Several Huawei home-router models fail to sufficiently verify input, and an attacker on the LAN can exploit that to make the device behave abnormally. The vector is adjacent-network with an availability-only impact, so this is a same-network disruption bug, not a takeover.
The adjacency requirement meaningfully bounds the threat: an attacker has to already be on the local network to reach the vulnerable surface, and even then the outcome is degraded service rather than data theft or control. That's a limited blast radius.
We rank this down given both the LAN-only reach and the DoS-only impact. The practical follow-through is a firmware inventory across the listed HiRouter and WS-series models so affected units get updated in routine cycles, without treating it as an urgent exposure.
References
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Frequently asked questions
What is CVE-2020-9122?
Some Huawei products have an insufficient input verification vulnerability. Attackers can exploit this vulnerability in the LAN to cause service abnormal on affected devices.Affected product versions include:HiRouter-CD30-10 version 10.0.2.5;HiRouter-CT31-10 version 10.0.2.20;WS5200-12 version 10.0.1.9;WS5281-10 version 10.0.5.10;WS5800-10 version 10.0.3.25;WS7100-10 version 10.0.5.21;WS7200-10 version 10.0.5.21.
How severe is CVE-2020-9122?
CVE-2020-9122 carries a CVSS 3.1 base score of 6.5, rated medium. On the Rainforest Risk Index — which weighs the severity alongside how easy the flaw is to reach and how broad its impact is — it scores 64 out of 100, in the elevated band.
How is CVE-2020-9122 exploited?
According to the CVSS vector (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H): attack vector Adjacent, attack complexity Low, privileges required None, user interaction None. Impact on confidentiality None, integrity None and availability High.
Which products are affected by CVE-2020-9122?
Public advisories list the following as affected: hirouter-cd30-10, hirouter-cd30-10 firmware, hirouter-ct31-10, hirouter-ct31-10 firmware, ws5200-12, ws5200-12 firmware, +8. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2020-9122?
Apply the fix the vendor published — the references on this page link to the primary advisories and patches. When patching can't happen right away, reduce the exposure of the affected component and watch it for exploitation attempts. Rainforest customers see this vulnerability correlated to their own assets and prioritized by real exposure, not by score alone.
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