CVE-2021-39999Network attack vector

Denial of service via packet validation overflow

Published Jul 11, 2022 · Updated Aug 4, 2024

Buffer overflow in Huawei eSE620X vESS V100R001C10SPC200 and V100R001C20SPC200 allows remote attackers to cause denial of service via packets. The DOPRA SSP packet-processing module insufficiently validates packet contents before copying data, allowing a crafted message to overrun a buffer. Exploitation requires the attacker to send packets to the affected module; successful exploitation interrupts service availability without reported confidentiality or integrity impact.

CVSS severity5.3
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Huawei eSE620X vESS V100R001C10SPC200 and V100R001C20SPC200 allows remote attackers to cause denial of service via packets. The DOPRA SSP packet-processing module insufficiently validates packet contents before copying data, allowing a crafted message to overrun a buffer. Exploitation requires the attacker to send packets to the affected module; successful exploitation interrupts service availability without reported confidentiality or integrity impact.

The record

CVE
CVE-2021-39999
Published
Jul 11, 2022
Updated
Aug 4, 2024
Vendor
Huawei Technologies Co., Ltd.
Product
eSE620X vESS
Classifications
CWE-120, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=V100R001C10SPC200,V100R001C20SPC200

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Huawei Technologies Co., Ltd. · eSE620X vESSversion=V100R001C10SPC200,V100R001C20SPC200

Published CVSS scores

7.8NVDAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3Huawei PSIRTCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.9Huawei PSIRTCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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