CVE-2021-33254: embedthis appweb NULL Pointer Dereference
CVSS: 7.5v3.1HighModified
Published 01-06-2022Last modified 03-08-2024
Vulnerability summary
CVE-2021-33254 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in embedthis appweb. EPSS estimates a 1.52% chance of exploitation in the next 30 days, higher than 74.2% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
1.52%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 01-06-2022PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in src/http/httpLib.c in EmbedThis Appweb Community Edition 8.2.1, allows attackers to cause a denial of service via the stream paramter to the parseUri function.
CVSS metrics
2 scores · 1 source · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesSingle source
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.52%
Chance of exploitation in the next 30 days
Percentile
74%
Versus all other CVEs
30-day change
0.00 pp
From 1.52% on 19-09-2026
19-09-202619-10-2026
EPSS score1.52%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (awxylitol.github.io)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Embedthis1 product
- appweb8.2.1
1 vendor · 1 product
References
1 links- awxylitol.github.io/2021/05/09/embedthis-appweb-npd-bug.htmlX Refsource MISCExploitPatchThird Party Advisory