Memory leak in Huawei S5300EI, S5300SI, S5310HI, and S6300EI Campus series switches with software V200R003C00 before V200R003SPH011 and V200R005C00 before V200R005SPH008; S2350EI and S5300LI Campus series switches with software V200R003C00 before V200R003SPH011, V200R005C00 before V200R005SPH008, and V200R006C00 before V200R006SPH002; S9300, S7700, and S9700 Campus series switches with software V200R003C00 before V200R003SPH011, V200R005C00 before V200R005SPH009, and V200R006C00 before V200R006SPH003; S5720HI and S5720EI Campus series switches with software V200R006C00 before V200R006SPH002; and S2300 and S3300 Campus series switches with software V100R006C05 before V100R006SPH022 allows remote authenticated users to cause a denial of service (memory consumption and device restart) by logging in and out of the (1) HTTPS or (2) SFTP server, related to SSL session information.
| Software | From | Fixed in |
|---|---|---|
| huawei / s5300ei_firmware | v200r003c00 | 200r003sph011 |
| huawei / s5300ei_firmware | v200r005c00 | 200r005sph008 |
| huawei / s5300si_firmware | v200r001c00 | 200r001sph018 |
| huawei / s5300si_firmware | v200r002c00 | 200r003sph011 |
| huawei / s5310hi_firmware | v200r001c00 | 200r001sph018 |
| huawei / s5310hi_firmware | v200r002c00 | 200r003sph011 |
| huawei / s6300ei_firmware | v200r001c00 | 200r001sph018 |
| huawei / s6300ei_firmware | v200r002c00 | 200r003sph011 |
| huawei / s5300li_firmware | v200r003c00 | 200r003sph011 |
| huawei / s5300li_firmware | v200r005c00 | 200r005sph008 |
| huawei / s5300li_firmware | v200r006c00 | 200r006sph002 |
| huawei / s2350ei_firmware | v200r003c00 | 200r003sph011 |
| huawei / s2350ei_firmware | v200r005c00 | 200r005sph008 |
| huawei / s2350ei_firmware | v200r006c00 | 200r006sph002 |
| huawei / s9300_firmware | v200r003c00 | 200r003sph011 |
| huawei / s9300_firmware | v200r005c00 | 200r005sph009 |
| huawei / s9300_firmware | v200r006c00 | 200r006sph003 |
| huawei / s9700_firmware | v200r003c00 | 200r003sph011 |
| huawei / s9700_firmware | v200r005c00 | 200r005sph009 |
| huawei / s9700_firmware | v200r006c00 | 200r006sph003 |
| huawei / s7700_firmware | v200r003c00 | 200r003sph011 |
| huawei / s7700_firmware | v200r005c00 | 200r005sph009 |
| huawei / s7700_firmware | v200r006c00 | 200r006sph003 |
| huawei / s5720hi_firmware | v200r006c00 | 200r006sph002 |
| huawei / s5720ei_firmware | v200r006c00 | 200r006sph002 |
| huawei / s2300_firmware | v100r006c05 | 100r006sph022 |
| huawei / s3300_firmware | v100r006c05 | 100r006sph022 |
A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.
Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.
Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.