CVE-2019-5255
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedCertain Huawei products (AP2000;IPS Module;NGFW Module;NIP6300;NIP6600;NIP6800;S5700;SVN5600;SVN5800;SVN5800-C;SeMG9811;Secospace AntiDDoS8000;Secospace USG6300;Secospace USG6500;Secospace USG6600;USG6000V;eSpace U1981) have a DoS vulnerability. An attacker may send crafted messages from a FTP client to exploit this vulnerability. Due to insufficient validation of the message, successful exploit may cause the system out-of-bounds read and result in a denial of service condition of the affected service.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThis is an input validation vulnerability in the FTP server component of multiple Huawei network security and ICT products. An attacker can send specially crafted FTP messages that trigger an out-of-bounds read due to insufficient validation, causing denial of service. The vulnerability is network-exploitable from a remote FTP client without authentication.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= v200r005c30= v200r006c10= v200r006c20= v200r007c10= v200r007c20= v200r008c00= v200r008c10= v200r009c00= v500r001c00spc300= v500r001c00spc500= v500r001c00sph303= v500r001c00sph508= v500r001c20= v500r001c20spc100= v500r001c20spc100pwe= v500r001c20spc200= v500r001c20spc200b062= v500r001c20spc200pwe= v500r001c20spc300b078= v500r001c20spc300pwe= v500r001c00spc300= v500r001c00spc500= v500r001c00spc500pwe= v500r001c00sph303= v500r001c00sph508= v500r001c20= v500r001c20spc100= v500r001c20spc100pwe= v500r001c20spc200= v500r001c20spc200b062= v500r001c20spc200pwe= v500r001c20spc300b078= v500r001c00spc300= v500r001c00spc500= v500r001c00sph303= v500r001c00sph508= v500r001c20= v500r001c20spc100= v500r001c20spc100pwe= v500r001c20spc200= v500r001c20spc200b062= v500r001c20spc200pwe= v500r001c20spc300b078= v500r001c20spc300pwe= v500r001c00spc300= v500r001c00spc500= v500r001c00sph303= v500r001c00sph508= v500r001c20= v500r001c20spc100= v500r001c20spc100pwe= v500r001c20spc200= v500r001c20spc200b062= v500r001c20spc200pwe= v500r001c20spc300b078= v500r001c30= v500r001c50= v500r001c50pwe= v500r001c80= v500r005c00= v200r005c03= v200r003c00spc100CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the Huawei product modelLocate the product label or log into the device management interface to confirm the exact model (e.g., AP2000, NIP6300, NIP6600, NIP6800, NGFW, IPS, SVN5600, S5700).Affected if The model matches one of the affected product lines listed in the CVE.
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Determine the firmware versionAccess the device CLI or web interface and run the command to display the firmware version (typically 'display version' or found in System > Device Information).Affected if The installed firmware version matches any of the versions listed in the affected versions for that product.
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Verify FTP server is enabledCheck the device configuration for FTP server settings via CLI command such as 'display ftp server' or via the web interface under Services > FTP.Affected if FTP server functionality is turned on and operational on the device.
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Assess network exposure of FTP serviceReview firewall policies or access control lists to determine if TCP port 21 (FTP) is open to untrusted networks or the internet. Use 'display firewall zone' or 'display ip interface' to inspect exposed interfaces.Affected if FTP port 21 is reachable from remote or untrusted network segments.
The environment is affected if the product model and firmware version match those listed in the CVE AND the FTP server is enabled and accessible.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply Huawei security patches for the affected products (AP2000, NIP/NGFW modules, SVN series, USG series, eSpace U1981). If patches are unavailable, restrict FTP access to trusted sources via firewall rules or disable the FTP service if not required.
- Consultation6.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,680.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-5255 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2019-5255 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data