How severe is CVE-2021-35041?

CVE-2021-35041 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-35041 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-35041?

CVE-2021-35041 affects Fisco-bcos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-35041?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-35041 published?

CVE-2021-35041 was published on 2021-06-24 and last updated on 2026-06-17.

CVE-2021-35041

CVE-2021-35041 is a high-severity vulnerability in Fisco-bcos with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Fisco-bcos
Published: 2021-06-24
Last modified: 2026-06-17

Description

The blockchain node in FISCO-BCOS V2.7.2 may have a bug when dealing with unformatted packet and lead to a crash. A malicious node can send a packet continuously. The packet is in an incorrect format and cannot be decoded by the node correctly. As a result, the node may consume the memory sustainably and crash. More details are shown at: https://github.com/FISCO-BCOS/FISCO-BCOS/issues/1951

Frequently asked questions

What is CVE-2021-35041?: The blockchain node in FISCO-BCOS V2.7.2 may have a bug when dealing with unformatted packet and lead to a crash. A malicious node can send a packet continuously. The packet is in an incorrect format and cannot be decoded by the node correctly. As a result, the node may consume the memory sustainably and crash. More details are shown at: https://github.com/FISCO-BCOS/FISCO-BCOS/issues/1951
How severe is CVE-2021-35041?: CVE-2021-35041 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-35041 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-35041?: CVE-2021-35041 affects Fisco-bcos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-35041?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-35041 published?: CVE-2021-35041 was published on 2021-06-24 and last updated on 2026-06-17.

References

https://github.com/FISCO-BCOS/FISCO-BCOS/issues/1951

Affected products (1)

cpe:2.3:a:fisco-bcos:fisco-bcos:2.7.2:*:*:*:*:*:*:*

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