CVE-2021-41036: eclipse paho_mqtt_c\/c\+\+_client Out-of-bounds Write
CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2021-41036
Published 02-11-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-41036 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in eclipse paho_mqtt_c\/c\+\+_client. EPSS estimates a 1.20% chance of exploitation in the next 30 days, higher than 67.8% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
1.20%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 02-11-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len size in readpacket.
CVSS metrics
3 scores · 2 sources · 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:HSourcesAll 2 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.20%
Chance of exploitation in the next 30 days
Percentile
68%
Versus all other CVEs
30-day change
0.00 pp
From 1.20% on 19-09-2026
19-09-202619-10-2026
EPSS score1.20%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Eclipse1 product
- paho_mqtt_c\/c\+\+_client< 1.1.0
The eclipse foundation1 product
- eclipse paho mqtt c client≥ unspecified, < 1.1.0
Ubuntu1 product
- paho.mqtt.cAll versions (No fix recorded)
3 vendors · 3 products
References
3 links- github.com/eclipse/paho.mqtt.embedded-c/issues/96X Refsource CONFIRMREPORTIssue TrackingPatchThird Party Advisory