CVE-2020-8443: ossec Off-by-one Error
CVSS: 9.8v3.1CriticalModified
Published 30-01-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-8443 is a critical (CVSS 9.8) Off-by-one Error vulnerability in ossec. EPSS estimates a 2.69% chance of exploitation in the next 30 days, higher than 85.6% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
2.69%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 30-01-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
In OSSEC-HIDS 2.7 through 3.5.0, the server component responsible for log analysis (ossec-analysisd) is vulnerable to an off-by-one heap-based buffer overflow during the cleaning of crafted syslog msgs (received from authenticated remote agents and delivered to the analysisd processing queue by ossec-remoted).
CVSS metrics
2 scores · 1 source · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesSingle source
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
2.69%
Chance of exploitation in the next 30 days
Percentile
86%
Versus all other CVEs
30-day change
0.00 pp
From 2.69% on 20-09-2026
20-09-202620-10-2026
EPSS score2.69%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundOssec Hids
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Ossec1 product
- ossec≥ 2.7, ≤ 3.5.0
1 vendor · 1 product