| Name | CVE-2021-3737 |
| Description | A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2808-1, DLA-3432-1, DLA-3477-1, ELA-510-1, ELA-853-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| pypy (PTS) | jessie | 2.4.0+dfsg-3 | vulnerable |
| stretch | 5.6.0+dfsg-4 | vulnerable | |
| buster | 7.0.0+dfsg-3 | vulnerable | |
| bullseye | 7.3.3+dfsg-2 | vulnerable | |
| pypy3 (PTS) | buster | 7.0.0+dfsg-3 | vulnerable |
| bullseye | 7.3.5+dfsg-2+deb11u2 | vulnerable | |
| bullseye (security) | 7.3.5+dfsg-2+deb11u3 | vulnerable | |
| bookworm | 7.3.11+dfsg-2+deb12u2 | fixed | |
| sid, trixie | 7.3.17+dfsg-2 | fixed | |
| python2.7 (PTS) | jessie, jessie (lts) | 2.7.9-2-ds1-1+deb8u12 | fixed |
| stretch (security) | 2.7.13-2+deb9u6 | vulnerable | |
| stretch (lts), stretch | 2.7.13-2+deb9u9 | fixed | |
| buster (security), buster, buster (lts) | 2.7.16-2+deb10u4 | fixed | |
| bullseye | 2.7.18-8+deb11u1 | vulnerable | |
| python3.4 (PTS) | jessie, jessie (lts) | 3.4.2-1+deb8u18 | fixed |
| python3.5 (PTS) | stretch (security) | 3.5.3-1+deb9u5 | fixed |
| stretch (lts), stretch | 3.5.3-1+deb9u10 | fixed | |
| python3.7 (PTS) | buster, buster (lts) | 3.7.3-2+deb10u8 | fixed |
| buster (security) | 3.7.3-2+deb10u7 | fixed | |
| python3.9 (PTS) | bullseye | 3.9.2-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| pypy | source | jessie | (unfixed) | end-of-life | ||
| pypy | source | buster | (unfixed) | end-of-life | ||
| pypy | source | (unstable) | (unfixed) | |||
| pypy3 | source | (unstable) | 7.3.8+dfsg-1 | |||
| python2.7 | source | jessie | 2.7.9-2-ds1-1+deb8u10 | ELA-853-1 | ||
| python2.7 | source | stretch | 2.7.13-2+deb9u7 | ELA-853-1 | ||
| python2.7 | source | buster | 2.7.16-2+deb10u2 | DLA-3432-1 | ||
| python2.7 | source | (unstable) | (unfixed) | |||
| python3.4 | source | jessie | 3.4.2-1+deb8u11 | ELA-510-1 | ||
| python3.4 | source | (unstable) | (unfixed) | |||
| python3.5 | source | stretch | 3.5.3-1+deb9u5 | DLA-2808-1 | ||
| python3.5 | source | (unstable) | (unfixed) | |||
| python3.7 | source | buster | 3.7.3-2+deb10u5 | DLA-3477-1 | ||
| python3.7 | source | (unstable) | (unfixed) | |||
| python3.9 | source | experimental | 3.9.6-1 | |||
| python3.9 | source | (unstable) | 3.9.7-1 |
[bullseye] - python3.9 <no-dsa> (Minor issue)
[bullseye] - python2.7 <ignored> (Unsupported in Bullseye, only included to build a few applications)
[bullseye] - pypy3 <no-dsa> (Minor issue)
[buster] - pypy3 <no-dsa> (Minor issue)
https://bugs.python.org/issue44022
https://github.com/python/cpython/pull/25916
https://github.com/python/cpython/pull/26503
https://github.com/python/cpython/commit/60ba0b68470a584103e28958d91e93a6db37ec92 (v3.10.0b2)
https://github.com/python/cpython/commit/ea9327036680acc92d9f89eaf6f6a54d2f8d78d9 (v3.9.6)
https://github.com/python/cpython/commit/f396864ddfe914531b5856d7bf852808ebfc01ae (v3.8.11)
https://github.com/python/cpython/commit/078b146f062d212919d0ba25e34e658a8234aa63 (v3.7.11)
https://github.com/python/cpython/commit/f68d2d69f1da56c2aea1293ecf93ab69a6010ad7 (v3.6.14)
Needs the "Improve the regression test" followup:
https://github.com/python/cpython/commit/98e5a7975d99b58d511f171816ecdfb13d5cca18 (v3.10.0b3)
https://github.com/python/cpython/commit/5df4abd6b033a5f1e48945c6988b45e35e76f647 (v3.9.6)
https://github.com/python/cpython/commit/0389426fa4af4dfc8b1d7f3f291932d928392d8b (3.8 branch)
https://github.com/python/cpython/commit/fee96422e6f0056561cf74fef2012cc066c9db86 (v3.7.11)
https://github.com/python/cpython/commit/1b6f4e5e13ebd1f957b47f7415b53d0869bdbac6 (v3.6.14