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Fencer Intel
high 7.5

CVE-2012-3543 json

mono 2.10.x ASP.NET Web Form Hash collision DoS

published 2019-11-21 6 y ago modified 2026-06-16 4 mo ago also EUVD-2012-3491

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

mono 2.10.x ASP.NET Web Form Hash collision DoS

Patch / fix

  • mono Debian 14, Debian 13, Debian 12 2.10.8.1-7

debian advisories DEBIAN-CVE-2012-3543

  • mono-core SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 2.6.7-0.18.1
  • mono-core SLES for SAP 11 SP4, SLES for SAP 11 SP3, SLES 11 SP4 +5 more 2.6.7-0.16.1

suse advisories SUSE-SU-2016:2958-1SUSE-SU-2016:0257-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-3543 updated cvss 5.0

mono: Hash collision issue

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.58% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • openwall.com http://www.openwall.com/lists/oss-security/2012/08/28/14 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • mono mono

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.