How severe is CVE-2017-8840?

CVE-2017-8840 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2017-8840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-8840?

CVE-2017-8840 primarily affects Peplink B305hw2 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-8840?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-8840 published?

CVE-2017-8840 was published on 2017-06-05 and last updated on 2026-06-17.

CVE-2017-8840

CVE-2017-8840 is a medium-severity vulnerability in Peplink B305hw2 Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Peplink B305hw2 Firmware
Published: 2017-06-05
Last modified: 2026-06-17

Description

Debug information disclosure exists on Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with firmware before fw-b305hw2_380hw6_580hw2_710hw3_1350hw2_2500-7.0.1-build2093. A direct request to cgi-bin/HASync/hasync.cgi?debug=1 shows Master LAN Address, Serial Number, HA Group ID, Virtual IP, and Submitted syncid.

Frequently asked questions

What is CVE-2017-8840?: Debug information disclosure exists on Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with firmware before fw-b305hw2_380hw6_580hw2_710hw3_1350hw2_2500-7.0.1-build2093. A direct request to cgi-bin/HASync/hasync.cgi?debug=1 shows Master LAN Address, Serial Number, HA Group ID, Virtual IP, and Submitted syncid.
How severe is CVE-2017-8840?: CVE-2017-8840 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2017-8840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-8840?: CVE-2017-8840 primarily affects Peplink B305hw2 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-8840?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-8840 published?: CVE-2017-8840 was published on 2017-06-05 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:o:peplink:b305hw2_firmware:7.0.1:*:*:*:*:*:*:*
cpe:2.3:o:peplink:380hw6_firmware:7.0.1:*:*:*:*:*:*:*
cpe:2.3:o:peplink:580hw2_firmware:7.0.1:*:*:*:*:*:*:*
cpe:2.3:o:peplink:710hw3_firmware:7.0.1:*:*:*:*:*:*:*
cpe:2.3:o:peplink:1350hw2_firmware:7.0.1:*:*:*:*:*:*:*
cpe:2.3:o:peplink:2500_firmware:7.0.1:*:*:*:*:*:*:*

More vulnerabilities in Peplink B305hw2 Firmware

CVE-2017-8837 — Critical (CVSS 9.8): Cleartext password storage exists on Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with firmware before…
CVE-2017-8835 — Critical (CVSS 9.8): SQL injection exists on Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with firmware before…
CVE-2017-8836 — High (CVSS 8.8): CSRF exists on Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with firmware before…
CVE-2017-8841 — High (CVSS 8.1): Arbitrary file deletion exists on Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with firmware before…
CVE-2017-8839 — Medium (CVSS 6.1): XSS via orig_url exists on Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with firmware before…
CVE-2017-8838 — Medium (CVSS 6.1): XSS via syncid exists on Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with firmware before…

All CVEs affecting Peplink B305hw2 Firmware →

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