CVE-2020-26521: fedoraproject fedora NULL Pointer Dereference
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2020-26521DEBIAN-CVE-2020-26521CGA-4wwf-qg7h-22ggCGA-662g-5rvw-3vr8CGA-fx85-h754-vx2mCGA-q8mw-3cpr-f69jGHSA-h2fg-54x9-5qhqGHSA-hmm9-r2m2-qg9wGO-2022-0402
Published 06-11-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-26521 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in fedoraproject fedora. EPSS estimates a 2.16% chance of exploitation in the next 30 days, higher than 81.9% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
2.16%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 0 · Related 2Timeline
- 06-11-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
The JWT library in NATS nats-server before 2.1.9 allows a denial of service (a nil dereference in Go code).
CVSS metrics
7 scores · 6 sources · 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:HSourcesAll 6 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · GoEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
2.16%
Chance of exploitation in the next 30 days
Percentile
82%
Versus all other CVEs
30-day change
+0.04 pp
From 2.12% on 19-09-2026
19-09-202619-10-2026
EPSS score2.16%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard2 products
- nats-serverAll versions (No fix recorded)
- nats-server-compatAll versions (No fix recorded)
Wolfi2 products
- nats-serverAll versions (No fix recorded)
- nats-server-compatAll versions (No fix recorded)
Debian1 product
- golang-github-nats-io-jwt< 2.2.0-1
Fedoraproject1 product
- fedoraEOL33
Github.com/nats-io1 product
- jwt< 1.1.0
Github.com/nats-io/nats-server1 product
- v2< 2.1.9
Linuxfoundation1 product
- nats-server< 2.1.9
Ubuntu1 product
- golang-github-nats-io-jwtAll versions (No fix recorded)
8 vendors · 10 products
References
17 links- www.openwall.com/lists/oss-security/2020/11/02/2X Refsource CONFIRMREPORTAdvisoryWEBMailing ListThird Party Advisory
Show all 17 references
- github.com/nats-io/jwtPACKAGE