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CVE-2020-7039
tcp_emu in tcp_subr.c in libslirp 4.1.0, as used in QEMU 4.2.0, mismanages memory, as demonstrated by IRC DCC commands in EMU_IRC. This…
Medium5.6EPSS 3.6%
- Published
- Updated
- Reserved
- Assigned by
- mitre
Description
tcp_emu in tcp_subr.c in libslirp 4.1.0, as used in QEMU 4.2.0, mismanages memory, as demonstrated by IRC DCC commands in EMU_IRC. This can cause a heap-based buffer overflow or other out-of-bounds access which can lead to a DoS or potential execute arbitrary code.
Timeline
ID reserved
By mitre
- 2 days later
· 2 days later
Published
- 5 years later
· 5 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.6 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L |
- EPSS (exploitation in 30 days)
- 3.6% · top 11% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.6.
Weakness
Affected products
n/a
- affected n/a
References (14)
- https://gitlab.freedesktop.org/slirp/libslirp/commit/ce131029d6d4a405cb7d3ac6716d03e58fb4a5d9 (opens in a new tab)x_refsource_MISCx_transferred
- https://gitlab.freedesktop.org/slirp/libslirp/commit/82ebe9c370a0e2970fb5695aa19aa5214a6a1c80 (opens in a new tab)x_refsource_MISCx_transferred
- https://gitlab.freedesktop.org/slirp/libslirp/commit/2655fffed7a9e765bcb4701dd876e9dab975f289 (opens in a new tab)x_refsource_MISCx_transferred
- http://www.openwall.com/lists/oss-security/2020/01/16/2 (opens in a new tab)x_refsource_CONFIRMx_transferred
- [debian-lts-announce] 20200126 [SECURITY] [DLA 2076-1] slirp security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [debian-lts-announce] 20200131 [SECURITY] [DLA 2090-1] qemu security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 20200203 [SECURITY] [DSA 4616-1] qemu security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- DSA-4616 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- RHSA-2020:0348 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- USN-4283-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- RHSA-2020:0775 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- openSUSE-SU-2020:0468 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- GLSA-202005-02 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- [debian-lts-announce] 20210209 [SECURITY] [DLA 2551-1] slirp security update (opens in a new tab)mailing-listx_refsource_MLISTx_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-2020-7039)Record last updated .