What is the CVSS score of CVE-2019-5257?

CVE-2019-5257 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.2%.

S5700 Firmware CVE-2019-5257

MEDIUM

Classic Buffer Overflow (CWE-120)

2019-12-13 psirt@huawei.com

Buffer Overflow Huawei S5700 Firmware Nip6300 Firmware Secospace Usg6500 Firmware Secospace Antiddos8000 Firmware Secospace Usg6300 Firmware Secospace Usg6600 Firmware Nip6600 Firmware Espace U1981 Firmware Nip6800 Firmware Svn5600 Firmware Svn5800 Firmware Svn5800 C Firmware Semg9811 Firmware Usg6000V Firmware Ap2000 Firmware Ips Firmware Ngfw Firmware

5.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-120 ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 5.5 (MEDIUM). Attack characteristics: local attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived	A local attacker with access to the system could overflow a buffer to corrupt adjacent memory.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAI

Certain Huawei products (AP2000;IPS Module;NGFW Module;NIP6300;NIP6600;NIP6800;S5700;SVN5600;SVN5800;SVN5800-C;SeMG9811;Secospace) have a resource management vulnerability. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.

Affects your stack

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Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. Certain Huawei products (AP2000;IPS Module;NGFW Module;NIP6300;NIP6600;NIP6800;S5700;SVN5600;SVN5800;SVN5800-C;SeMG9811;Secospace) have a resource management vulnerability. An attacker who logs in to the board may send crafted messages from the internal network. Affected products include: Huawei Ap2000 Firmware, Huawei Ips Firmware, Huawei Ngfw Firmware, Huawei Nip6300 Firmware, Huawei Nip6600 Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.5 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

Certain Huawei products (AP2000;IPS Module;NGFW Module;NIP6300;NIP6600;NIP6800;S5700;SVN5600;SVN5800;SVN5800-C;SeMG9811;Secospace) have a resource management vulnerability. An attacker who logs in to the board may send crafted messages from the internal network.

Threat Intelligence Overview

EPSS Score

0.2%

Top 90% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.2%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Defer

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +28

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Affected Products (CPE)NVD

cpe:2.3:o:huawei:ap2000_firmware:v200r005c30:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ap2000_firmware:v200r006c10:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ap2000_firmware:v200r006c20:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ap2000_firmware:v200r007c10:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ap2000_firmware:v200r007c20:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ap2000_firmware:v200r008c00:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ap2000_firmware:v200r008c10:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ap2000_firmware:v200r009c00:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c00spc300:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c00spc500:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c00sph303:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c00sph508:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c20:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c20spc100:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c20spc100pwe:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c20spc200:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c20spc200b062:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c20spc200pwe:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c20spc300b078:*:*:*:*:*:*:*

cpe:2.3:o:huawei:ips_firmware:v500r001c20spc300pwe:*:*:*:*:*:*:*

+ 224 more

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References

Advisories & patches

ADVISORY https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20191211-01-ssp-en

Search Externally

GitHub PoC

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