PatchTheCVECVE-2018-20056: An issue was discovered in /bin/boa on D-Link DIR-619L Rev.B 2.06B1 and DIR-605L Rev.B 2.12B1 devices
CVE-2018-20056 is a critical-severity flaw (CVSS 9.8) affecting dir-619l firmware, dir-605l firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in /bin/boa on D-Link DIR-619L Rev.B 2.06B1 and DIR-605L Rev.B 2.12B1 devices. There is a stack-based buffer overflow allowing remote attackers to execute arbitrary code without authentication via the goform/formLanguageChange currTime parameter.
Why this priority
- Critical severity
- EPSS top 6%: very likely to be exploited
- Public exploit reference
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 7.0% (top 6%) |
| CISA exploited list | No |
| Weakness | CWE-787 |
| Published | 2018-12-11 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2018-20056?
dir-619l firmware: mitigate or apply the listed mitigation; dir-605l firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2018-20056 being exploited?
CVE-2018-20056 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2018-20056 affect?
CVE-2018-20056 affects dir-619l firmware, dir-605l firmware. Severity is critical (CVSS 9.8). An issue was discovered in /bin/boa on D-Link DIR-619L Rev.B 2.06B1 and DIR-605L Rev.B 2.12B1 devices. There is a stack-based buffer overflow allowing remote attackers to execute arbitrary code without authentication via the goform/formLang
How urgent is CVE-2018-20056?
Priority 68/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action
Software pages
Related CVEs
- CVE-2026-2056 MEDIUM 5.3 MITIGATE MITIGATE A security vulnerability has been detected in D-Link DIR-605L and DIR-619L 2.06B01/2.13B01
- CVE-2026-2055 MEDIUM 5.3 MITIGATE MITIGATE A weakness has been identified in D-Link DIR-605L and DIR-619L 2.06B01/2.13B01
- CVE-2026-2054 MEDIUM 5.3 MITIGATE MITIGATE A security flaw has been discovered in D-Link DIR-605L and DIR-619L 2.06B01/2.13B01
- CVE-2025-8978 MEDIUM 6.6 MITIGATE A vulnerability was determined in D-Link DIR-619L 6.02CN02
- CVE-2025-6617 HIGH 8.8 MITIGATE A vulnerability was found in D-Link DIR-619L 2.06B01 and classified as critical