Is CVE-2024-39920 in the CISA KEV catalog?

No. CVE-2024-39920 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-39920?

CVE-2024-39920 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2024-39920?

CVE-2024-39920 has an EPSS score of 0.57% (44th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2024-39920?

No published fix for CVE-2024-39920 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2024-39920

MEDIUM

4.3

CVSS v3

NVD

Description

The TCP protocol in RFC 9293 has a timing side channel that makes it easier for remote attackers to infer the content of one TCP connection from a client system (to any server), when that client system is concurrently obtaining TCP data at a slow rate from an attacker-controlled server, aka the "SnailLoad" issue. For example, the attack can begin by measuring RTTs via the TCP segments whose role is to provide an ACK control bit and an Acknowledgment Number.

CWE-1255

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorAdjacent

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.57%probability of exploitation in 30 days

44thpercentile

Moderate risk: more likely to be exploited than 44% of all known CVEs.

References

Other references8

Related Vulnerabilities

Other CWE-1255 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-25714	Critical	9.8	0.8%	-	Fix
CVE-2025-3301	Unscored	-	0.2%	-	-

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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.