HOMEVULNERABILITIESCVE-2021-43839
HIGH

CVE-2021-43839

CWE-670Published: December 21, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Cronos is a commercial implementation of a blockchain. In Cronos nodes running versions before v0.6.5, it is possible to take transaction fees from Cosmos SDK's FeeCollector for the current block by sending a custom crafted MsgEthereumTx. This problem has been patched in Cronos v0.6.5. There are no tested workarounds. All validator node operators are recommended to upgrade to Cronos v0.6.5 at their earliest possible convenience.

NVD Source

Technical Analysis

CVE-2021-43839 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

crypto3 product(s)
cronosethermintevmos
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/crypto-org-chain/cronos/commit/150ef237b37ac28c8136e1c0f494932860b9ebe8
PATCHhttps://github.com/crypto-org-chain/cronos/pull/270
PATCHhttps://github.com/crypto-org-chain/cronos/commit/150ef237b37ac28c8136e1c0f494932860b9ebe8
PATCHhttps://github.com/crypto-org-chain/cronos/pull/270
ADVISORYhttps://github.com/crypto-org-chain/cronos/security/advisories/GHSA-f854-hpxv-cw9r
ADVISORYhttps://github.com/crypto-org-chain/cronos/security/advisories/GHSA-f854-hpxv-cw9r

All References (6)

→
https://github.com/crypto-org-chain/cronos/commit/150ef237b37ac28c8136e1c0f494932860b9ebe8Patch · Third Party Advisory
→
https://github.com/crypto-org-chain/cronos/pull/270Patch · Third Party Advisory
→
https://github.com/crypto-org-chain/cronos/security/advisories/GHSA-f854-hpxv-cw9rThird Party Advisory
→
https://github.com/crypto-org-chain/cronos/commit/150ef237b37ac28c8136e1c0f494932860b9ebe8Patch · Third Party Advisory
→
https://github.com/crypto-org-chain/cronos/pull/270Patch · Third Party Advisory
→
https://github.com/crypto-org-chain/cronos/security/advisories/GHSA-f854-hpxv-cw9rThird Party Advisory

Quick Facts

CVE IDCVE-2021-43839
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-670
CISA KEVNo
Affected1 vendor(s)
PublishedDec 21, 2021

Related CVEs (CWE-670)

CVE-2021-41153
9.8
CVE-2022-21679
9.8
CVE-2019-17192
9.8
CVE-2020-17466
9.8
CVE-2020-1914
9.8
CVE-2022-25745
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-43839 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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