CVE-2021-34273: A security flaw in the 'owned' function of a smart contract implementation for BTC2X (B2X), a tradeable Ethere

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HIGH 7.5REMOTEMITIGATE

CVE-2021-34273 is a high-severity flaw (CVSS 7.5) affecting b2x. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A security flaw in the 'owned' function of a smart contract implementation for BTC2X (B2X), a tradeable Ethereum ERC20 token, allows attackers to hijack victim accounts and arbitrarily increase the digital supply of assets.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Published	2021-08-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: b2x project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-03 22:15 UTCPublished CVE record published
2026-06-17 03:55 UTCUpdated Record last modified

b2x project b2x MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy b2x || rpm -q b2x || b2x --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-34273?

b2x: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-34273 being exploited?

CVE-2021-34273 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-34273 affect?

CVE-2021-34273 affects b2x. Severity is high (CVSS 7.5). A security flaw in the 'owned' function of a smart contract implementation for BTC2X (B2X), a tradeable Ethereum ERC20 token, allows attackers to hijack victim accounts and arbitrarily increase the digital supply of assets.

How urgent is CVE-2021-34273?

Priority 52/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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