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CVE-2021-26758

26
FAUCET Score

CVE-2021-26758 is a high-severity privilege escalation vulnerability affecting LiteSpeed Technologies OpenLiteSpeed web server version 1.7.8. An authenticated attacker can exploit this flaw to gain root terminal access and execute arbitrary commands on the host system. With a CVSS score of 8.8, this vulnerability presents a significant risk due to its low attack complexity and high impact on confidentiality, integrity, and availability. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the potential for a complete system compromise warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
1.7.8CPE matchmatch criteria
cpe:2.3:a:litespeedtech:openlitespeed:1.7.8:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.71%
Probability of exploitation in next 30 days
EPSS Percentile
84.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0271 is in the 83rd percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

docs.unsafe-inline.com / 0day/openlitespeed-web-server-1.7.8-command-injection-to-privilege-escalation-cve-2021-26758
ExploitThird Party Advisory
github.com / litespeedtech/openlitespeed/issues/217
ExploitThird Party Advisory
exploit-db.com / exploits/49556
ExploitThird Party AdvisoryVDB Entry