CVE-2020-24034 json
Sagemcom F@ST 5280 routers using firmware version 1.150.61 have insecure deserialization that allows any authenticated user to perform a pr…
published 6y ago modified 4mo ago also EUVD-2020-16770
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.7%
- EPSS 3.7% chance of exploitation in 30 days, percentile 89%
- public exploits
- 0
- none known
Summary
Sagemcom F@ST 5280 routers using firmware version 1.150.61 have insecure deserialization that allows any authenticated user to perform a privilege escalation to any other user. By making a request with valid sess_id, nonce, and ha1 values inside of the serialized session cookie, an attacker may alter the user value inside of this cookie, and assume the role and permissions of the user specified. By assuming the role of the user internal, which is inaccessible to end users by default, the attacker gains the permissions of the internal account, which includes the ability to flash custom firmware to the router, allowing the attacker to achieve a complete compromise.
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Check with FencerExploit prediction
3.67% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- packetstormsecurity.com http://packetstormsecurity.com/files/159026/Sagemcom-F-ST-5280-Privilege-Escalation.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 9.0 | AV:N/AC:L/Au:S/C:C/I:C/A:C |
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
-
packetstormsecurity.com
/files/159026/Sagemcom-F-ST-5280-Privilege-Escalation.html
exploit, third-party-advisory, vdb-entry
-
support.sagemcom.com
/fr/haut-debit
vendor-advisory
-
seclists.org
/fulldisclosure/2020/Sep/3
mailing-list, third-party-advisory
-
seclists.org
/fulldisclosure/2020/Sep/3
mailing-list, third-party-advisory
Sources
- CVE List CVE-2020-24034
- NVD CVE-2020-24034
Fencer Intel 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.