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Vulnerability Details :

CVE-2025-6703

Assigner Org ID-f16b083a-5664-49f3-a51e-8d479e5ed7fe

Published At-26 Jun, 2025 | 09:30

Updated At-26 Jun, 2025 | 12:59

transport/fc.rs: panic attempting to send MAX_DATA with value larger max varint

Improper Input Validation vulnerability in Mozilla neqo leads to an unexploitable crash..This issue affects neqo: from 0.4.24 through 0.13.2.

EPSS History

Score

Latest Score

N/A

Percentile

Latest Percentile

N/A

▼Common Vulnerabilities and Exposures (CVE)

cve.org

Assigner:mozilla

Assigner Org ID:f16b083a-5664-49f3-a51e-8d479e5ed7fe

Published At:26 Jun, 2025 | 09:30

Updated At:26 Jun, 2025 | 12:59

▼CVE Numbering Authority (CNA)

transport/fc.rs: panic attempting to send MAX_DATA with value larger max varint

Improper Input Validation vulnerability in Mozilla neqo leads to an unexploitable crash..This issue affects neqo: from 0.4.24 through 0.13.2.

Affected Products

Vendor

Mozilla Corporation

Product

neqo

Repo

https://github.com/mozilla/neqo

Default Status

unaffected

Versions

Affected

From 0.4.24 through 0.13.2 (semver)

Problem Types

Type	CWE ID	Description
CWE	CWE-20	CWE-20 Improper Input Validation

Type: CWE

CWE ID: CWE-20

Description: CWE-20 Improper Input Validation

Metrics

Version	Base score	Base severity	Vector
4.0	2.3	LOW	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/R:A/RE:L/U:Clear

Version: 4.0

Base score: 2.3

Base severity: LOW

Vector:

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/R:A/RE:L/U:Clear

Impacts

CAPEC ID	Description
CAPEC-227	CAPEC-227 Sustained Client Engagement

CAPEC ID: CAPEC-227

Description: CAPEC-227 Sustained Client Engagement

References

Hyperlink	Resource
https://github.com/mozilla/neqo/security/advisories/GHSA-jfv6-x22w-grhf	N/A

Hyperlink: https://github.com/mozilla/neqo/security/advisories/GHSA-jfv6-x22w-grhf

Resource: N/A

▼Authorized Data Publishers (ADP)

CISA ADP Vulnrichment

Metrics Other Info

▼National Vulnerability Database (NVD)

nvd.nist.gov

Source:security@mozilla.org

Published At:26 Jun, 2025 | 10:15

Updated At:26 Jun, 2025 | 18:57

Improper Input Validation vulnerability in Mozilla neqo leads to an unexploitable crash..This issue affects neqo: from 0.4.24 through 0.13.2.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	4.0	2.3	LOW	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:X/RE:L/U:Clear

Type: Secondary

Version: 4.0

Base score: 2.3

Base severity: LOW

Vector:

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:X/RE:L/U:Clear

Weaknesses

CWE ID	Type	Source
CWE-20	Secondary	security@mozilla.org

CWE ID: CWE-20

Type: Secondary

Source: security@mozilla.org

References

Hyperlink	Source	Resource
https://github.com/mozilla/neqo/security/advisories/GHSA-jfv6-x22w-grhf	security@mozilla.org	N/A

Hyperlink: https://github.com/mozilla/neqo/security/advisories/GHSA-jfv6-x22w-grhf

Source: security@mozilla.org

Resource: N/A

CVE-2025-6703

Credits

transport/fc.rs: panic attempting to send MAX_DATA with value larger max varint

Vendors

Products

Metrics (CVSS)

Weaknesses

Attack Patterns

Solution/Workaround

References

EPSS History

Score

Latest Score

N/A

Percentile

Latest Percentile

N/A

Stakeholder-Specific Vulnerability Categorization (SSVC)

Affected Products

Affected

Problem Types

Metrics

Metrics Other Info

Impacts

Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

Rejected Reason

References

Affected Products

Metrics

Metrics Other Info

Impacts

Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

Rejected Reason

References

CISA Catalog

Metrics

CPE Matches

Weaknesses

Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References

Change History

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