CVE-2021-3127

unknown

Published 2022-02-15 · Modified 2026-02-04

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CVSS v3

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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

NATS Server 2.x before 2.2.0 and JWT library before 2.0.1 have Incorrect Access Control because Import Token bindings are mishandled.

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
debian	bookworm	fixed	`2.2.0-1`
debian	forky	fixed	`2.2.0-1`
debian	sid	fixed	`2.2.0-1`
debian	trixie	fixed	`2.2.0-1`

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	github.com/nats-io/jwt	`<=1.2.2`
Go	github.com/nats-io/jwt/v2	`<2.0.1`	`2.0.1`
Go	github.com/nats-io/nats-server/v2	`<2.2.0`	`2.2.0`
Go	github.com/nats-io/jwt	`<1.2.3-0.20210314221642-a826c77dc9d2`	`1.2.3-0.20210314221642-a826c77dc9d2`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.