CVE-2020-12821 json
Gossipsub 1.0 does not properly resist invalid message spam, such as an eclipse attack or a sybil attack.
published 2020-07-07 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-5104
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.9%
- EPSS 1.9% chance of exploitation in 30 days, percentile 80%
- public exploits
- 0
- none known
Summary
Gossipsub 1.0 does not properly resist invalid message spam, such as an eclipse attack or a sybil attack.
Patch / fix
- github.com/ipfs/blog#450 pull request
Exploit prediction
1.94% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- gateway.ipfs.io https://gateway.ipfs.io/ipfs/QmPWuNBs8h6a8KamRvGqhTq5UDYJRQsEEy37zDKjujQQQm/Gossipsub%20Evaluation%20Report.pdf referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
References
-
github.com
/ipfs/blog/pull/450
patch, third-party-advisory
-
gateway.ipfs.io
/ipfs/QmPWuNBs8h6a8KamRvGqhTq5UDYJRQsEEy37zDKjujQQQm/Gossipsub%20Evaluation%20Report.pdf
exploit, vendor-advisory
-
github.com
/libp2p/specs/tree/master/pubsub/gossipsub
third-party-advisory
-
github.com
/libp2p/specs/blob/master/pubsub/gossipsub/gossipsub-v1.1.md
third-party-advisory
-
bitcoin.stackexchange.com
/questions/61151/eclipse-attack-vs-sybil-attack
third-party-advisory
Sources
- CVE List CVE-2020-12821
- NVD CVE-2020-12821
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