3.8

CVE-2021-3593: debian debian_linux Access of Uninitialized Pointer

Modified
AliasesSUSE-SU-2022:2941-1UBUNTU-CVE-2021-3593DEBIAN-CVE-2021-3593
Published 15-06-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-3593 is a low (CVSS 3.8) Access of Uninitialized Pointer vulnerability in debian debian_linux. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 25.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
3.8/10
010
Low · v3.1 (NVD)
EPSS score
0.33%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 16 · Related 12
DLA-2970-1DLA-3362-1MGASA-2021-0480OPENSUSE-SU-2021:1202-1OPENSUSE-SU-2021:2474-1OPENSUSE-SU-2021:2591-1

Timeline

  1. 15-06-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

26%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.33% on 05-10-2026

05-10-202604-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse4 products
  • libslirp&distro=SUSE Linux Enterprise Micro 5.1< 4.3.1-150300.11.1
  • libslirp&distro=SUSE Linux Enterprise Micro 5.2< 4.3.1-150300.11.1
  • libslirp&distro=SUSE Linux Enterprise Module for Server Applications 15 SP3< 4.3.1-150300.11.1
  • libslirp&distro=SUSE Linux Enterprise Module for Server Applications 15 SP4< 4.3.1-150300.11.1
Debian3 products
Opensuse3 products
  • libslirp&distro=openSUSE Leap 15.3< 4.3.1-150300.11.1
  • libslirp&distro=openSUSE Leap 15.4< 4.3.1-150300.11.1
  • libslirp&distro=openSUSE Leap Micro 5.2< 4.3.1-150300.11.1
Ubuntu2 products
  • libslirp< 4.1.0-2ubuntu2.2 | < 4.6.1-1
  • qemu< 1:2.11+dfsg-1ubuntu7.37
Alpine1 product
  • libslirp< 4.6.0-r0
Fedoraproject1 product
Libslirp_project1 product
Redhat1 product

8 vendors · 16 products

References

19 links
Show all 19 references