CVE-2018-17787
CVE-2018-17787 is a critical-severity vulnerability in D-link Dir-823g Firmware with a CVSS 3.x base score of 9.8. 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-78.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 4% (88th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-78
- Affected product: D-link Dir-823g Firmware
- Published:
- Last modified:
Description
On D-Link DIR-823G devices, the GoAhead configuration allows /HNAP1 Command Injection via shell metacharacters in the POST data, because this data is sent directly to the "system" library function.
Frequently asked questions
- What is CVE-2018-17787?
- On D-Link DIR-823G devices, the GoAhead configuration allows /HNAP1 Command Injection via shell metacharacters in the POST data, because this data is sent directly to the "system" library function.
- How severe is CVE-2018-17787?
- CVE-2018-17787 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2018-17787 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-2018-17787?
- CVE-2018-17787 affects D-link Dir-823g Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2018-17787?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2018-17787 published?
- CVE-2018-17787 was published on 2018-10-02 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:d-link:dir-823g_firmware:-:*:*:*:*:*:*:*
More vulnerabilities in D-link Dir-823g Firmware
- CVE-2019-7297 — Critical (CVSS 9.8): An issue was discovered on D-Link DIR-823G devices with firmware through 1.02B03. A command Injection vulnerability…
- CVE-2018-17881 — Critical (CVSS 9.8): On D-Link DIR-823G 2018-09-19 devices, the GoAhead configuration allows /HNAP1 SetPasswdSettings commands without…
- CVE-2018-17786 — Critical (CVSS 9.8): On D-Link DIR-823G devices, ExportSettings.sh, upload_settings.cgi, GetDownLoadSyslog.sh, and upload_firmware.cgi do…
- CVE-2018-17880 — High (CVSS 7.5): On D-Link DIR-823G 2018-09-19 devices, the GoAhead configuration allows /HNAP1 RunReboot commands without…
All CVEs affecting D-link Dir-823g Firmware →
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