CVE-2021-28683: envoyproxy envoy NULL Pointer Dereference
CVSS: 7.5v3.1HighModified
Published 20-05-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-28683 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in envoyproxy envoy. EPSS estimates a 1.69% chance of exploitation in the next 30 days, higher than 76.6% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
1.69%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2Timeline
- 20-05-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in Envoy through 1.71.1. There is a remotely exploitable NULL pointer dereference and crash in TLS when an unknown TLS alert code is received.
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
1.69%
Chance of exploitation in the next 30 days
Percentile
77%
Versus all other CVEs
30-day change
0.00 pp
From 1.69% on 19-09-2026
19-09-202619-10-2026
EPSS score1.69%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Envoyproxy1 product
- envoyEOL1.16.2 | 1.17.1
1 vendor · 1 product
References
4 links- github.com/envoyproxy/envoy/security/advisories/GHSA-r22g-5f3x-xjggX Refsource MISCNot ApplicableThird Party Advisory
- github.com/envoyproxy/envoy/security/advisories/GHSA-xw4q-6pj2-5gfgThird Party Advisory