CVE-2020-5138: sonicwall sonicos Heap-based Buffer Overflow
Vulnerability summary
CVE-2020-5138 is a high (CVSS 7.5) Heap-based Buffer Overflow vulnerability in sonicwall sonicos. EPSS estimates a 1.77% chance of exploitation in the next 30 days, higher than 77.7% of scored vulnerabilities.
Timeline
- 12-10-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A Heap Overflow vulnerability in the SonicOS allows a remote unauthenticated attacker to cause Denial of Service (DoS) on the firewall SSLVPN service and leads to SonicOS crash. This vulnerability affected SonicOS Gen 5 version 5.9.1.7, 5.9.1.13, Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version SonicOS 7.0.0.0.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
1.77%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
0.00 pp
From 1.77% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Sonicwall2 products
- sonicosSonicOS 6.5.4.7-79n and earlier | SonicOS 5.9.1.7-2n and earlier | SonicOS 5.9.1.13-5n and earlier | SonicOS 6.5.1.11-4n and earlier | SonicOS 6.0.5.3-93o and earlier | SonicOSv 6.5.4.4-44v-21-794 and earlier | SonicOS 7.0.0.0-1 | ≤ 5.9.1.13 | ≥ 6.0.0.0, ≤ 6.0.5.3 | ≥ 6.5.0.0, ≤ 6.5.1.11 | ≥ 6.5.4.0, ≤ 6.5.4.7 | 7.0.0.0
- sonicosv≤ 6.5.4.4
1 vendor · 2 products