Is CVE-2021-40839 in the CISA KEV catalog?

No. CVE-2021-40839 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-40839?

CVE-2021-40839 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-40839?

CVE-2021-40839 has an EPSS score of 5.48% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-40839?

Upgrade python-rencode on debian 12 to 1.0.6-2 or later.

CVE & CISA-KEV Catalog

CVE-2021-40839

HIGHEPSS 92th pctl

7.5

CVSS v3

NVD

Description

The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\x2f\x7f), enabling a remote attack that consumes CPU and memory.

CWE-835

How to fix

Remediation Available

python-rencodeDebian

Fixed in:1.0.6-2CVE-2021-40839

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

5.48%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch2

Third-Party Advisory3

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.