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CVE-2021-3595
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the tftp_input()…
Low3.8EPSS 0.33%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the tftp_input() function and could occur while processing a udp packet that is smaller than the size of the 'tftp_t' 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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Low3.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.33% · top 74% of all CVEs (6 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 3.8.
Weakness
Affected products
QEMU
- affected libslirp 4.6.0
References (7)
- https://bugzilla.redhat.com/show_bug.cgi?id=1970489 (opens in a new tab)x_transferred
- FEDORA-2021-71de23bedd (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2021-7cd749f133 (opens in a new tab)vendor-advisoryx_transferred
- GLSA-202107-44 (opens in a new tab)vendor-advisoryx_transferred
- https://security.netapp.com/advisory/ntap-20210805-0004/ (opens in a new tab)x_transferred
- [debian-lts-announce] 20210902 [SECURITY] [DLA 2753-1] qemu security update (opens in a new tab)mailing-listx_transferred
- [debian-lts-announce] 20230314 [SECURITY] [DLA 3362-1] qemu security update (opens in a new tab)mailing-listx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-3595)Record last updated .