CVE-2021-21745
MediumExploitedZTE MF971R product has a Referer authentication bypass vulnerability.
Published Oct 20, 2021 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2021-21745 is a medium-severity vulnerability (CVSS 4.3 v3.1) affecting Mf971r Firmware (Zte), MF971R.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Oct 20, 2021. No public exploit code is known.
- EPSS estimates a 56% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
4.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS (30-day exploit likelihood)
56%
Higher than 99.0% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
None known
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Description
ZTE MF971R product has a Referer authentication bypass vulnerability. Without CSRF verification, an attackercould use this vulnerability to perform illegal authorization operations by sending a request to the user to click.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Jan 22, 2024 | n/a | Not reported |
| CIRCL KEV | Oct 20, 2021 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Mf971r FirmwareZte | 1v1.0.0b06, 2v1.0.0b03, s2v1.0.0b03, sv1.0.0b05, v1.0.0b05 | n/a |
| MF971R | >= BD_ZTE_MF971RV1.0.0B05, BD_PLKPLMF971R1V1.0.0B06, BD_MF971R2V1.0.0B03, BD_ZTE_MF971RS2V1.0.0B03, BD_ZTE_MF971RSV1.0.0B05 | n/a |
Timeline
Publicly disclosed
Oct 20, 2021
Added to CIRCL KEV
Oct 20, 2021
Added to Industry KEV feed
Jan 22, 2024
Last updated
Nov 21, 2024
Weakness Type
- CWE-352 Cross-Site Request Forgery (CSRF)
References
- advisoryhttps://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1019764
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
ZTE MF971R product has a Referer authentication bypass vulnerability.
Affected: Mf971r Firmware (Zte) versions 1v1.0.0b06, 2v1.0.0b03, s2v1.0.0b03, sv1.0.0b05, v1.0.0b05; MF971R versions >= BD_ZTE_MF971RV1.0.0B05, BD_PLKPLMF971R1V1.0.0B06, BD_MF971R2V1.0.0B03, BD_ZTE_MF971RS2V1.0.0B03, BD_ZTE_MF971RSV1.0.0B05. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Oct 20, 2021.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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