CVE-2021-27209 json
In the management interface on TP-Link Archer C5v 1.7_181221 devices, credentials are sent in a base64 format over cleartext HTTP.
published 2021-02-13 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13974
- cvss
- 7.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
In the management interface on TP-Link Archer C5v 1.7_181221 devices, credentials are sent in a base64 format over cleartext HTTP.
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- gokay.org https://gokay.org/tp-link-archer-c5v-base64-cookie/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| NVD | 2.0 | 3.6 | AV:L/AC:L/Au:N/C:P/I:P/A:N |
Classification
- Weakness
-
- CWE-319 Cleartext Transmission of Sensitive Information
References
-
gokay.org
/tp-link-archer-c5v-base64-cookie/
exploit, third-party-advisory
Sources
- CVE List CVE-2021-27209
- NVD CVE-2021-27209
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.